[Backport stable-26-2-1] PR #49242: Fix flaky test_discovery_exclusive_nodes under sanitizers

[ydbot]

Changelog entry

Fix flaky test_discovery_exclusive_nodes under sanitizers

Description for reviewers

Original PR(s)

• PR Fix flaky test_discovery_exclusive_nodes under sanitizers #49242

Metadata

• Original PR author(s): @pixcc
• Cherry-picked by: @ydbot
• Related issues: [sanitizer] Serverless test_discovery_exclusive_nodes VERIFY / Cannot start static tenant tenant_pool.cpp:504 (release-tsan) #48622

Git Cherry-Pick Log

=== Cherry-picking b6880ec ===
[cherry-pick-stable-26-2-1-260807-103518 c206221d6b1] Fix flaky test_discovery_exclusive_nodes under sanitizers (#49242)
 Author: Ilia Shakhov <pixcc@ydb.tech>
 Date: Fri Aug 7 13:26:15 2026 +0300
 1 file changed, 10 insertions(+), 2 deletions(-)

---

PR was created by cherry-pick workflow run

[ydbot]

Run Extra Tests

Run additional tests for this PR. You can customize:

• Test Size: small, medium, large (default: small, medium)
• Test Targets: any directory path (default: ydb/)
• Sanitizers: ASAN, MSAN, TSAN
• Coredumps: enable for debugging (default: off)
• Additional args: custom ya make arguments

[github-actions]

⚪ 2026-08-07 10:40:13 UTC Pre-commit check linux-x86_64-release-asan for ea10e3d has started.
⚪ 2026-08-07 10:41:09 UTC Artifacts will be uploaded here
⚪ 2026-08-07 10:43:01 UTC ya make is running...
🟢 2026-08-07 10:51:51 UTC Tests successful.

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
147	147	0	0	0	0

🟢 2026-08-07 10:51:53 UTC Build successful.

[github-actions]

⚪ 2026-08-07 10:40:29 UTC Pre-commit check linux-x86_64-relwithdebinfo for ea10e3d has started.
⚪ 2026-08-07 10:40:49 UTC Artifacts will be uploaded here
⚪ 2026-08-07 10:42:13 UTC ya make is running...
🟢 2026-08-07 10:49:06 UTC Tests successful.

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
149	149	0	0	0	0

🟢 2026-08-07 10:49:08 UTC Build successful.