merge to stable-25-3 YQ-4312 streaming in ydb fixes and features

[GrigoriyPA]

Changelog entry

Streaming in ydb fixes and features

Changelog category

• Not for changelog (changelog entry is not required)

Description for reviewers

• YQ-4682 fixed fault for checkpoint on not drained channels (YQ-4682 fixed fault for checkpoint on not drained channels #25515)
• YQ-4711 fixed test ReadTopicFailedWithoutAvailableExternalDataSourcesYdbTopics (YQ-4711 fixed test ReadTopicFailedWithoutAvailableExternalDataSourcesYdbTopics #25619)
• YQ-4723 Use own driver in leader election (YQ-4723 Use own driver in leader election #25770)
• YQ-4664 used AS threads in topic sdk IO operations (YQ-4664 used AS threads in topic sdk IO operations #25668)

[github-actions]

🟢 2025-09-26 17:42:38 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2025-09-26 17:43:36 UTC Pre-commit check linux-x86_64-relwithdebinfo for c55bf5b has started.
⚪ 2025-09-26 17:43:52 UTC Artifacts will be uploaded here
⚪ 2025-09-26 17:47:41 UTC ya make is running...
🟡 2025-09-26 19:29:29 UTC Some tests failed, follow the links below. Going to retry failed tests...

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
39975	37182	0	4	2760	29

⚪ 2025-09-26 19:33:04 UTC ya make is running... (failed tests rerun, try 2)
🟢 2025-09-26 19:46:15 UTC Tests successful.

Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
443 (only retried tests)	428	0	0	0	15

🟢 2025-09-26 19:46:24 UTC Build successful.
🟢 2025-09-26 19:46:42 UTC ydbd size 2.3 GiB changed* by +55.8 KiB, which is < 100.0 KiB vs stable-25-3: OK

ydbd size dash	stable-25-3: bfc0198	merge: c55bf5b	diff	diff %
ydbd size	2 430 506 408 Bytes	2 430 563 544 Bytes	+55.8 KiB	+0.002%
ydbd stripped size	520 718 984 Bytes	520 737 736 Bytes	+18.3 KiB	+0.004%

^{*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]

⚪ 2025-09-26 17:44:12 UTC Pre-commit check linux-x86_64-release-asan for c55bf5b has started.
⚪ 2025-09-26 17:44:27 UTC Artifacts will be uploaded here
⚪ 2025-09-26 17:48:09 UTC ya make is running...
🟡 2025-09-26 20:02:32 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
17315	16795	0	138	352	30

🟢 2025-09-26 20:04:01 UTC Build successful.
🟢 2025-09-26 20:04:23 UTC ydbd size 3.8 GiB changed* by +87.5 KiB, which is < 100.0 KiB vs stable-25-3: OK

ydbd size dash	stable-25-3: bfc0198	merge: c55bf5b	diff	diff %
ydbd size	4 043 727 272 Bytes	4 043 816 864 Bytes	+87.5 KiB	+0.002%
ydbd stripped size	1 506 406 752 Bytes	1 506 450 720 Bytes	+42.9 KiB	+0.003%

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