schemeshard: fix stats processing op1, part 3

[ijon]

Fix-up to:

• schemeshard: stats processing optimizations #27165

Fix disk space aggregation for column tables.
Separate subdomain and storage pool kind aggregation level more robust.
Add tests on subdomain level aggregation.

[Copilot]

Pull request overview

This PR fixes disk space aggregation for column tables by refactoring how disk space usage deltas are processed. The key issue addressed is that column table statistics were not being properly aggregated at the subdomain level after a schemeshard reboot.

Key changes:

• Removed unused diskSpaceUsageDelta parameter from UpdateTableStats methods for column tables
• Changed AggrDiskSpaceUsage to treat disk space usage delta as an ordered vector instead of a map, with total space at index 0 and per-pool deltas at subsequent indices
• Added comprehensive test coverage for disk space usage with various table configurations (regular tables, column tables in stores, standalone column tables)

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
ydb/core/tx/schemeshard/ut_subdomain/ya.make	Added dependencies for columnshard testing utilities
ydb/core/tx/schemeshard/ut_subdomain/ut_subdomain.cpp	Added extensive test coverage for disk space usage tracking across different table types and configurations
ydb/core/tx/schemeshard/schemeshard_info_types.h	Removed diskSpaceUsageDelta parameter from UpdateTableStats signature
ydb/core/tx/schemeshard/schemeshard_info_types.cpp	Refactored AggrDiskSpaceUsage to treat delta as ordered vector; simplified UpdateTableStats implementation
ydb/core/tx/schemeshard/schemeshard__table_stats.cpp	Updated call site to match new UpdateTableStats signature
ydb/core/tx/schemeshard/olap/table/table.h	Updated UpdateTableStats signature and implementation for column tables

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[github-actions]

🟢 2025-12-01 08:02:13 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2025-11-29 19:41:07 UTC Pre-commit check linux-x86_64-release-asan for 00ef793 has started.
⚪ 2025-11-29 19:41:26 UTC Artifacts will be uploaded here
⚪ 2025-11-29 19:43:37 UTC ya make is running...
🟡 2025-11-29 21:02:33 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?
11962	11807	0	125	18	12

🟢 2025-11-29 21:02:43 UTC Build successful.
🟢 2025-11-29 21:03:09 UTC ydbd size 3.8 GiB changed* by +2.5 KiB, which is < 100.0 KiB vs main: OK

ydbd size dash	main: 4d52fb5	merge: 00ef793	diff	diff %
ydbd size	4 120 837 760 Bytes	4 120 840 336 Bytes	+2.5 KiB	+0.000%
ydbd stripped size	1 530 278 072 Bytes	1 530 278 584 Bytes	+512 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]

⚪ 2025-11-29 19:41:17 UTC Pre-commit check linux-x86_64-relwithdebinfo for 00ef793 has started.
⚪ 2025-11-29 19:41:34 UTC Artifacts will be uploaded here
⚪ 2025-11-29 19:43:46 UTC ya make is running...
🟡 2025-11-29 21:20:45 UTC Some tests failed, follow the links below. Going to retry failed tests...

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
39592	36724	0	1	2842	25

⚪ 2025-11-29 21:20:57 UTC ya make is running... (failed tests rerun, try 2)
🟢 2025-11-29 21:31:19 UTC Tests successful.

Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
44 (only retried tests)	31	0	0	0	13

🟢 2025-11-29 21:31:26 UTC Build successful.
🟢 2025-11-29 21:31:48 UTC ydbd size 2.3 GiB changed* by +1.6 KiB, which is < 100.0 KiB vs main: OK

ydbd size dash	main: 4d52fb5	merge: 00ef793	diff	diff %
ydbd size	2 462 318 488 Bytes	2 462 320 160 Bytes	+1.6 KiB	+0.000%
ydbd stripped size	524 149 216 Bytes	524 149 344 Bytes	+128 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}