Added stress test

[pmahindrakar-oss]

Example run

examples/stress/sleep_fanout_harness_wrapper.sh \                                                                           flyte
    --config ~/.flyte/config-dogfood.yaml \
    --total-runs 20 \
    --submit-concurrency 20 \
    --n-children 5000 \
    --sleep-duration 900 \
    --poll-interval 2 \
    --run-env _F_MAX_QPS=100 \
    --run-env _F_CTRL_WORKERS=10 \
    --run-env _F_P_CNC=5000
Launching local multi-run harness
  config: /Users/praful/.flyte/config-dogfood.yaml
  total_runs: 20
  submit_concurrency: 20
  n_children_per_run: 5000
  total_children_expected: 100000
  sleep_duration: 900
  poll_interval: 2s
  image target: 376129846803.dkr.ecr.us-east-2.amazonaws.com/union/dogfood
  image builder: remote
  image platforms: linux/amd64
  sdk source: installed flyte via /Users/praful/flyte-sdk/.venv/bin/flyte
  sdk wheel: /Users/praful/flyte-sdk/dist/flyte-2.0.0b18.dev742+g55744f779.d20260427-py3-none-any.whl
  warning: src/flyte is newer than the dist wheel; remote image will not include recent SDK src changes until you rebuild the wheel
  fanout parent resources: cpu 1/2, memory 2Gi/4Gi
  use_actions: 1
  run env overrides: _F_MAX_QPS=100 _F_CTRL_WORKERS=10 _F_P_CNC=5000

time     runs         p_live   p_run    seen_children      not_created    d_seen   create_rps rps/p    eta_fill   running  active  
12:14:39 0/20         0        0        0/100000           100000         0        0          0        0          0        0       
12:14:41 0/20         0        0        0/100000           100000         0        0          0        0          0        0       
12:14:43 0/20         0        0        0/100000           100000         0        0          0        0          0        0       
launch: [12] submit failed rc=1 output='  > Launching remote execution...\n  > Building 2 images...\n    > Building image dogfood for environment sleep_fanout\n    > Building image dogfood for environment sleep_fanout_leaf\n    i Image dogfood:414bee6cdf4315469657ed44360c8d54 was not found or has\nexpired\n    > Image\n376129846803.dkr.ecr.us-east-2.amazonaws.com/union/dogfood:414bee6cdf4315469657e\nd44360c8d54 not found, building...\n\x1b[2;36m╭─\x1b[0m\x1b[2;36m────\x1b[0m\x1b[2;36m \x1b[0m\x1b[1;2;38;5;220mException\x1b[0m\x1b[2;36m \x1b[0m\x1b[2;36m─────\x1b[0m\x1b[2;36m─╮\x1b[0m\n\x1b[2;36m│\x1b[0m \x1b[31m✕ Execution failed:\x1b[0m  \x1b[2;36m│\x1b[0m\n\x1b[2;36m╰──────────────────────╯\x1b[0m'
12:14:45 0/20         0        0        0/100000           100000         0        0          0        0          0        0       
12:14:59 15/20        15       15       0/100000           100000         0        n/a        n/a      n/a        0        0       
12:15:19 19/20        19       19       1354/100000        98646          1354     67.7       3.6      00:24:18   647      647     
12:15:47 19/20        19       19       5950/100000        94050          4596     164.1      8.6      00:09:33   3462     3462    
12:16:23 19/20        19       19       12029/100000       87971          6079     168.9      8.9      00:08:41   8114     8114    
12:17:16 19/20        19       19       19718/100000       80282          7689     145.1      7.6      00:09:14   18121    18121   
12:18:31 19/20        18       18       30988/100000       69012          11270    150.3      8.3      00:07:40   28970    28970   
12:20:30 19/20        18       18       55537/100000       44463          24549    206.3      11.5     00:03:36   37370    37370   
12:23:13 19/20        18       18       80892/100000       19108          25355    155.6      8.6      00:02:03   62501    62501   
12:46:32 19/20        18       18       90000/100000       10000          9108     6.5        0.4      00:25:37   74220    74220   
13:00:25 19/20        18       18       90000/100000       10000          0        0.0        0.0      n/a        78895    78895   
13:03:21 19/20        18       18       90000/100000       10000          0        0.0        0.0      n/a        79592    79592   
13:06:21 19/20        18       18       90000/100000       10000          0        0.0        0.0      n/a        79778    79778   
13:09:22 19/20        18       18       90000/100000       10000          0        0.0        0.0      n/a        80167    80167   
13:12:23 19/20        18       18       90000/100000       10000          0        0.0        0.0      n/a        80398    80398   
13:15:30 19/20        18       18       90000/100000       10000          0        0.0        0.0      n/a        80421    80421   
13:18:30 19/20        18       18       90000/100000       10000          0        0.0        0.0      n/a        80495    80495   
13:21:31 19/20        18       18       90000/100000       10000          0        0.0        0.0      n/a        80782    80782   
13:24:33 19/20        18       18       90000/100000       10000          0        0.0        0.0      n/a        77706    77706   
13:27:34 19/20        17       17       90000/100000       10000          0        0.0        0.0      n/a        68591    68591   
13:30:45 19/20        12       12       90000/100000       10000          0        0.0        0.0      n/a        56168    56168   
13:33:49 19/20        1        1        90000/100000       10000          0        0.0        0.0      n/a        22738    22738   
13:36:50 19/20        1        1        90000/100000       10000          0        0.0        0.0      n/a        11840    11840   
13:39:51 19/20        1        1        90000/100000       10000          0        0.0        0.0      n/a        11840    11840   
13:42:51 19/20        1        1        90000/100000       10000          0        0.0        0.0      n/a        11840    11840   
13:45:52 19/20        1        1        90000/100000       10000          0        0.0        0.0      n/a        11840    11840   
13:48:49 19/20        1        1        90000/100000       10000          0        0.0        0.0      n/a        7841     7841    
^C
Received INT, stopping local submissions and aborting discovered runs.
13:49:48                                                                  0        0.0        n/a      n/a                         

Aggregate Summary
  runs_discovered: /20
  total_expected_children: 100000
  child_run_roots_terminal: /
  peak_parent_live: 19
  peak_parent_running: 19
  children_seen: /100000
  succeeded: 
  failed: 
  aborted: 
  timed_out: 
  peak_seen: 90000/100000
  peak_running: 80782
  peak_active: 80782
  peak_create_rps: 206
  first_run_discovered: 00h:00m:08s
  aggregate_first_running: 00h:00m:40s
  aggregate_all_visible: n/a
  aggregate_terminal: 01h:35m:09s
  total_elapsed: 01h:35m:09s