Antalya-25.8 - Move workflows and docs

[strtgbb]

Changelog category (leave one):

• Documentation (changelog entry is not required)
• CI Fix or Improvement (changelog entry is not required)

TODO

• Copy workflows and other .github files
  • .github/workflows/README.md was excluded due to being outdated
• Copy top level .md files
• New SECURITY.md and CONTRIBUTING.md
• Review scheduled runs

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)
• Tiered Storage (2h)

[github-actions]

Workflow [PR], commit [6646a8a]