Apply pod template labels and annotations to Spark applications

[Tom-Newton]

Tracking issue

Somewhat tenuously related to #6348

Why are the changes needed?

Currently labels and annotations from pod templates are not propagated to driver and executor pods of spark applications. This affects default pod templates and the pod_template argument to @task. driver_pod and executor_pod arguments already work.

What changes were proposed in this pull request?

• Merge in the labels and annotations from pod templates.
• I considered adding these labels and annotations on the top level spark applciation object, so that the spark-opeartor could merge them into pods. I think this is how ray does it, but the spark operator only merges in labels, not annotations.

How was this patch tested?

• Updated a unit test
• Deployed it in our cluster and it works.

Check all the applicable boxes

• I updated the documentation accordingly. - I don't think any update is necessary
• All new and existing tests passed.
• All commits are signed-off.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.03%. Comparing base (fb49a7f) to head (d5018b8).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7514   +/-   ##
=======================================
  Coverage   57.03%   57.03%           
=======================================
  Files         931      931           
  Lines       58387    58389    +2     
=======================================
+ Hits        33301    33303    +2     
  Misses      22025    22025           
  Partials     3061     3061           

Flag	Coverage Δ
unittests-datacatalog	53.51% <ø> (ø)
unittests-flyteadmin	53.15% <ø> (ø)
unittests-flytecopilot	43.06% <ø> (ø)
unittests-flytectl	64.09% <ø> (ø)
unittests-flyteidl	75.71% <ø> (ø)
unittests-flyteplugins	60.35% <100.00%> (+<0.01%)	⬆️
unittests-flytepropeller	53.79% <ø> (ø)
unittests-flytestdlib	62.78% <ø> (ø)

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