rd + watermarks: transfer single watermark per batch (backport #25209)

[yumkam]

(cherry picked from commit 3db6964)

Changelog entry

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Changelog category

• New feature
• Experimental feature
• Improvement
• Performance improvement
• User Interface
• Bugfix
• Backward incompatible change
• Documentation (changelog entry is not required)
• Not for changelog (changelog entry is not required)

Description for reviewers

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[github-actions]

⚪ 2025-09-26 13:58:56 UTC Pre-commit check linux-x86_64-release-asan for 84b4599 has started.
⚪ 2025-09-26 13:59:11 UTC Artifacts will be uploaded here
⚪ 2025-09-26 14:01:57 UTC ya make is running...
🟡 2025-09-26 15:29:28 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet Going to retry failed tests...

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
12646	12508	0	78	35	25

⚪ 2025-09-26 15:30:36 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-09-26 16:01:11 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet Going to retry failed tests...

Test history | Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
1013 (only retried tests)	928	0	41	21	23

⚪ 2025-09-26 16:01:26 UTC ya make is running... (failed tests rerun, try 3)
🟡 2025-09-26 16:26:04 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

Test history | Ya make output | Test bloat | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
707 (only retried tests)	616	0	40	29	22

🟢 2025-09-26 16:26:15 UTC Build successful.

[github-actions]

⚪ 2025-09-26 14:04:31 UTC Pre-commit check linux-x86_64-relwithdebinfo for 84b4599 has started.
⚪ 2025-09-26 14:05:14 UTC Artifacts will be uploaded here
⚪ 2025-09-26 14:08:43 UTC ya make is running...
🟡 2025-09-26 15:14:11 UTC Some tests failed, follow the links below. Going to retry failed tests...

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
27207	24539	0	6	2630	32

⚪ 2025-09-26 15:16:43 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-09-26 15:42:26 UTC Some tests failed, follow the links below. Going to retry failed tests...

Test history | Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
139 (only retried tests)	106	0	2	2	29

⚪ 2025-09-26 15:42:35 UTC ya make is running... (failed tests rerun, try 3)
🟢 2025-09-26 16:08:56 UTC Tests successful.

Test history | Ya make output | Test bloat | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
99 (only retried tests)	62	0	0	10	27

🟢 2025-09-26 16:09:03 UTC Build successful.