Rename RowCount => ChunkCount to align with semantics and make it less confusing (#15080)

[Hor911]

#15105

[github-actions]

⚪ 2025-03-13 10:28:00 UTC Pre-commit check linux-x86_64-relwithdebinfo for 65e2578 has started.
⚪ 2025-03-13 10:28:15 UTC Artifacts will be uploaded here
⚪ 2025-03-13 10:31:27 UTC ya make is running...
🟡 2025-03-13 12:14:47 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?
28235	25629	0	8	2462	136

⚪ 2025-03-13 12:17:12 UTC ya make is running... (failed tests rerun, try 2)
🟢 2025-03-13 12:38:04 UTC Tests successful.

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
221 (only retried tests)	90	0	0	0	131

🟢 2025-03-13 12:38:12 UTC Build successful.
🟢 2025-03-13 12:38:31 UTC ydbd size 2.1 GiB changed* by +48 Bytes, which is < 100.0 KiB vs stable-25-1-1: OK

ydbd size dash	stable-25-1-1: 0a53720	merge: 65e2578	diff	diff %
ydbd size	2 242 079 360 Bytes	2 242 079 408 Bytes	+48 Bytes	+0.000%
ydbd stripped size	474 856 568 Bytes	474 856 568 Bytes	0 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]

⚪ 2025-03-13 10:28:21 UTC Pre-commit check linux-x86_64-release-asan for 65e2578 has started.
⚪ 2025-03-13 10:28:36 UTC Artifacts will be uploaded here
⚪ 2025-03-13 10:31:58 UTC ya make is running...
🟡 2025-03-13 12:22:27 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?
13977	13880	0	53	5	39

⚪ 2025-03-13 12:23:51 UTC ya make is running... (failed tests rerun, try 2)
🟢 2025-03-13 12:44:38 UTC Tests successful.

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
145 (only retried tests)	108	0	0	2	35

🟢 2025-03-13 12:44:45 UTC Build successful.
🟢 2025-03-13 12:45:11 UTC ydbd size 3.6 GiB changed* by -16 Bytes, which is <= 0 Bytes vs stable-25-1-1: OK

ydbd size dash	stable-25-1-1: 0a53720	merge: 65e2578	diff	diff %
ydbd size	3 900 116 616 Bytes	3 900 116 600 Bytes	-16 Bytes	-0.000%
ydbd stripped size	1 365 036 720 Bytes	1 365 036 656 Bytes	-64 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}