Fix incorrect Uuid serialization for CDC. (#12587)

[dcherednik]

TCell stores uuid as binary data therefore it can contains \0 byte.

Changelog category

• Bugfix

[github-actions]

⚪ 2024-12-13 10:21:20 UTC Pre-commit check for 459f38a has started.
⚪ 2024-12-13 10:24:01 UTC Build linux-x86_64-relwithdebinfo is running...
🟢 2024-12-13 11:04:32 UTC Build successful.
⚪ 2024-12-13 11:04:46 UTC Tests are running...
🔴 2024-12-13 12:33:42 UTC Some tests failed, follow the links below.

Test history | Test log

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
14697	13350	0	9	1301	37

🟢 2024-12-13 12:34:35 UTC ydbd size 8.3 GiB changed* by -424 Bytes, which is <= 0 Bytes vs stable-24-3: OK

ydbd size dash	stable-24-3: 6d9da7e	merge: 459f38a	diff	diff %
ydbd size	8 873 141 760 Bytes	8 873 141 336 Bytes	-424 Bytes	-0.000%
ydbd stripped size	484 331 176 Bytes	484 331 496 Bytes	+320 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]

⚪ 2024-12-13 10:21:28 UTC Pre-commit check for 459f38a has started.
⚪ 2024-12-13 10:24:07 UTC Build linux-x86_64-release-asan is running...
🟢 2024-12-13 10:46:55 UTC Build successful.
⚪ 2024-12-13 10:47:09 UTC Tests are running...
🔴 2024-12-13 12:48:54 UTC Some tests failed, follow the links below.

Test history | Test log

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
10372	10284	0	18	26	44

🟢 2024-12-13 12:49:38 UTC ydbd size 5.6 GiB changed* by +2.9 KiB, which is < 100.0 KiB vs stable-24-3: OK

ydbd size dash	stable-24-3: 6d9da7e	merge: 459f38a	diff	diff %
ydbd size	6 002 150 096 Bytes	6 002 153 064 Bytes	+2.9 KiB	+0.000%
ydbd stripped size	1 504 133 824 Bytes	1 504 135 296 Bytes	+1.4 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}