Extend schemeshard and compatibility tests for DEFAULT columns

[dahbka-lis]

Changelog entry

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Changelog category

• Not for changelog (changelog entry is not required)

Description for reviewers

• Remove repeated code to create ServerLessDB, add more checks for columns of tables (SS ut for column building).
• Add compatibility tests for DEFAULT columns (create table, alter table add column) for all types of DS.

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[github-actions]

⚪ 2025-10-09 12:35:27 UTC Pre-commit check linux-x86_64-relwithdebinfo for ae485b1 has started.
⚪ 2025-10-09 12:35:59 UTC Artifacts will be uploaded here
⚪ 2025-10-09 12:39:25 UTC ya make is running...
🟢 2025-10-09 12:53:31 UTC Tests successful.

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
1045	1041	0	0	3	1

🟢 2025-10-09 12:53:33 UTC Build successful.
🟢 2025-10-09 12:54:16 UTC ydbd size 2.3 GiB changed* by 0 Bytes, which is <= 0 Bytes vs main: OK

ydbd size dash	main: 8e11f9f	merge: ae485b1	diff	diff %
ydbd size	2 418 016 288 Bytes	2 418 016 288 Bytes	0 Bytes	0.000%
ydbd stripped size	515 025 544 Bytes	515 025 544 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]

⚪ 2025-10-09 12:36:26 UTC Pre-commit check linux-x86_64-release-asan for ae485b1 has started.
⚪ 2025-10-09 12:36:40 UTC Artifacts will be uploaded here
⚪ 2025-10-09 12:39:22 UTC ya make is running...
🟡 2025-10-09 13:07:40 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
883	780	0	16	87	0

🟢 2025-10-09 13:07:46 UTC Build successful.
🟢 2025-10-09 13:08:02 UTC ydbd size 3.7 GiB changed* by -96 Bytes, which is <= 0 Bytes vs main: OK

ydbd size dash	main: 8e11f9f	merge: ae485b1	diff	diff %
ydbd size	4 021 700 504 Bytes	4 021 700 408 Bytes	-96 Bytes	-0.000%
ydbd stripped size	1 494 054 912 Bytes	1 494 054 848 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}