25-1: add followers support for secondary indexes (#17965)

[azevaykin]

Changelog entry

Add ability to enable followers (read replicas) for covered secondary indexes

Changelog category

• New feature

Description for reviewers

KIKIMR-21403

[github-actions]

🟢 2025-06-04 13:28:40 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2025-06-04 13:31:00 UTC Pre-commit check linux-x86_64-relwithdebinfo for 1ec5360 has started.
⚪ 2025-06-04 13:31:12 UTC Artifacts will be uploaded here
⚪ 2025-06-04 13:34:39 UTC ya make is running...
🟡 2025-06-04 15:19:39 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?
28785	26269	0	3	2452	61

⚪ 2025-06-04 15:22:01 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-06-04 15:42:57 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?
122 (only retried tests)	63	0	1	0	58

⚪ 2025-06-04 15:43:05 UTC ya make is running... (failed tests rerun, try 3)
🟢 2025-06-04 16:03:23 UTC Tests successful.

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
112 (only retried tests)	54	0	0	0	58

🟢 2025-06-04 16:03:32 UTC Build successful.
🟢 2025-06-04 16:03:55 UTC ydbd size 2.1 GiB changed* by +18.2 KiB, which is < 100.0 KiB vs stable-25-1: OK

ydbd size dash	stable-25-1: 475d5eb	merge: 1ec5360	diff	diff %
ydbd size	2 251 439 352 Bytes	2 251 457 960 Bytes	+18.2 KiB	+0.001%
ydbd stripped size	476 394 552 Bytes	476 397 016 Bytes	+2.4 KiB	+0.001%

^{*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]

⚪ 2025-06-04 13:31:17 UTC Pre-commit check linux-x86_64-release-asan for 1ec5360 has started.
⚪ 2025-06-04 13:31:28 UTC Artifacts will be uploaded here
⚪ 2025-06-04 13:34:48 UTC ya make is running...
🟡 2025-06-04 15:24:45 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?
14800	14662	0	37	67	34

⚪ 2025-06-04 15:26:06 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-06-04 15:46:32 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?
184 (only retried tests)	92	0	7	52	33

⚪ 2025-06-04 15:46:44 UTC ya make is running... (failed tests rerun, try 3)
🟡 2025-06-04 16:06:18 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?
120 (only retried tests)	43	0	7	38	32

🟢 2025-06-04 16:06:25 UTC Build successful.
🟢 2025-06-04 16:06:56 UTC ydbd size 3.6 GiB changed* by +27.2 KiB, which is < 100.0 KiB vs stable-25-1: OK

ydbd size dash	stable-25-1: 475d5eb	merge: 1ec5360	diff	diff %
ydbd size	3 916 780 016 Bytes	3 916 807 920 Bytes	+27.2 KiB	+0.001%
ydbd stripped size	1 369 775 536 Bytes	1 369 778 800 Bytes	+3.2 KiB	+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}