Fix resolved timestamp emitted too early for some displaced upserts

[snaury]

Changelog entry

Fix resolved timestamp emitted too early for some displaced upserts

Changelog category

• Bugfix

Additional information

When an upsert is displaced (when current timestamp is blocked by a repeatable read) and shares timestamp with the next scheduled heartbeat, it was possible for that heartbeat to emit while we may still add more writes with that timestamp. The issue is fixed by using the correct comparison.

Found this bug while investigating #6985.

[github-actions]

⚪ 2024-09-06 10:05:26 UTC Pre-commit check linux-x86_64-release-clang14 for 53688b4 has started.
⚪ 2024-09-06 10:08:12 UTC ya make is running...
🟢 2024-09-06 10:14:05 UTC Build successful.

[github-actions]

⚪ 2024-09-06 10:07:00 UTC Pre-commit check linux-x86_64-release-asan for 53688b4 has started.
⚪ 2024-09-06 10:09:49 UTC ya make is running...
🔴 2024-09-06 11:42:28 UTC Some tests failed, follow the links below.

Test history | Ya make output

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
10096	10019	0	27	24	26

🟢 2024-09-06 11:43:22 UTC Build successful.
🟢 2024-09-06 11:43:55 UTC ydbd size 5.6 GiB changed* by -3.3 KiB, which is <= 0 Bytes vs main: OK

ydbd size dash	main: 0b897b9	merge: 53688b4	diff	diff %
ydbd size	6 028 914 536 Bytes	6 028 911 112 Bytes	-3.3 KiB	-0.000%
ydbd stripped size	1 509 645 488 Bytes	1 509 644 592 Bytes	-896 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]

⚪ 2024-09-06 10:07:06 UTC Pre-commit check linux-x86_64-relwithdebinfo for 53688b4 has started.
⚪ 2024-09-06 10:10:06 UTC ya make is running...
🟡 2024-09-06 11:15:27 UTC Some tests failed, follow the links below. Going to retry failed tests...

Test history | Ya make output

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
14709	13302	0	6	1378	23

⚪ 2024-09-06 11:16:42 UTC ya make is running... (failed tests rerun, try 2)
🟢 2024-09-06 11:26:40 UTC Tests successful.

Test history | Ya make output

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
49 (only retried tests)	31	0	0	0	18

🟢 2024-09-06 11:26:47 UTC Build successful.
🟢 2024-09-06 11:27:22 UTC ydbd size 8.4 GiB changed* by -2.3 KiB, which is <= 0 Bytes vs main: OK

ydbd size dash	main: 0b897b9	merge: 53688b4	diff	diff %
ydbd size	9 013 279 192 Bytes	9 013 276 800 Bytes	-2.3 KiB	-0.000%
ydbd stripped size	487 289 416 Bytes	487 289 224 Bytes	-192 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}