Antalya 26.6: Added support for iceberg v3 unknown data type

[subkanthi]

Changelog category (leave one):

• New Feature
• Experimental Feature
• Improvement
• Performance Improvement
• Backward Incompatible Change
• Build/Testing/Packaging Improvement
• Documentation (changelog entry is not required)
• Critical Bug Fix (crash, data loss, RBAC)
• Bug Fix (user-visible misbehavior in an official stable release)
• CI Fix or Improvement (changelog entry is not required)
• 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

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CI/CD Options

Exclude tests:

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

Regression jobs to run:

• Fast suites (mostly <1h)
• Aggregate Functions (2h)
• Alter (1.5h)
• Benchmark (30m)
• CAS (content-addressed storage; Antalya only)
• ClickHouse Keeper (1h)
• Iceberg (2h)
• LDAP (1h)
• OAuth (5m)
• Parquet (1.5h)
• RBAC (1.5h)
• SSL Server (1h)
• S3 (2h)
• S3 Export (2h)
• Swarms (30m)
• Tiered Storage (2h)

[github-actions]

Workflow [PR], commit [d9ce0bd]