Add ubrella-clickhose-review and codebase-consistency-reviewer skills

[filimonov]

Changelog category (leave one):

• Not for changelog (changelog entry is not required)

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

...

Documentation entry for user-facing changes

2 skills for claude for clickhouse developement.

Usage is simple:

/codebase-consistency-reviewer <commit range | pr number | commit ett>

this checks if your code 're-invite the bicycle' by doing the thing which was done 100 times before, and proposes rewrites.

and

/ubrella-clickhose-review <commit range | pr number | commit ett>

check the code from several different angles by several independent sub-agents, each focused on one thing, and cross-checking / summarizing their findings in one reports.

CI/CD Options

Exclude tests:

• Fast test
• Integration Tests
• Stateless tests
• Stateful tests
• Performance tests
• All with ASAN
• All with TSAN
• All with MSAN
• All with UBSAN
• All with Coverage
• All with Aarch64
• All Regression
• Disable CI Cache

Regression jobs to run:

• Fast suites (mostly <1h)
• Aggregate Functions (2h)
• Alter (1.5h)
• Benchmark (30m)
• ClickHouse Keeper (1h)
• Iceberg (2h)
• LDAP (1h)
• Parquet (1.5h)
• RBAC (1.5h)
• SSL Server (1h)
• S3 (2h)
• S3 Export (2h)
• Swarms (30m)
• Tiered Storage (2h)

[github-actions]

Workflow [PR], commit [0985961]