Bridge Mode in SB: fail sync requests on concurrent reconfiguration

[jepett0]

Changelog entry

Changelog category

• Not for changelog (changelog entry is not required)

Description for reviewers

Epic:

• 👑 Bridge mode support in Scheme Board #19748

Issue:

• Bridge Mode in SB: gracefully continue sync request execution in case of config change #20645

[github-actions]

⚪ 2025-07-07 11:24:29 UTC Pre-commit check linux-x86_64-relwithdebinfo for ce67ab2 has started.
⚪ 2025-07-07 11:24:43 UTC Artifacts will be uploaded here
⚪ 2025-07-07 11:28:01 UTC ya make is running...
🔴 2025-07-07 12:41:53 UTC Too many tests failed, NOT going to retry
🔴 2025-07-07 12:44:19 UTC Some tests failed, follow the links below.

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
29942	27674	0	565	1632	71

🟢 2025-07-07 12:47:06 UTC Build successful.
🟢 2025-07-07 12:47:30 UTC ydbd size 2.2 GiB changed* by +960 Bytes, which is < 100.0 KiB vs main: OK

ydbd size dash	main: 2674df3	merge: ce67ab2	diff	diff %
ydbd size	2 387 893 536 Bytes	2 387 894 496 Bytes	+960 Bytes	+0.000%
ydbd stripped size	499 612 200 Bytes	499 612 456 Bytes	+256 Bytes	+0.000%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[github-actions]

⚪ 2025-07-07 11:24:35 UTC Pre-commit check linux-x86_64-release-asan for ce67ab2 has started.
⚪ 2025-07-07 11:24:47 UTC Artifacts will be uploaded here
⚪ 2025-07-07 11:28:07 UTC ya make is running...
🟡 2025-07-07 13:16:29 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
14555	13818	0	488	219	30

🟢 2025-07-07 13:17:52 UTC Build successful.
🟢 2025-07-07 13:18:26 UTC ydbd size 3.9 GiB changed* by +2.2 KiB, which is < 100.0 KiB vs main: OK

ydbd size dash	main: 2674df3	merge: ce67ab2	diff	diff %
ydbd size	4 200 044 824 Bytes	4 200 047 080 Bytes	+2.2 KiB	+0.000%
ydbd stripped size	1 455 242 360 Bytes	1 455 243 320 Bytes	+960 Bytes	+0.000%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[github-actions]

🟢 2025-07-07 11:36:22 UTC The validation of the Pull Request description is successful.