Improve deployment orchestrator performance

[shangyian]

Summary

Reduce database interaction in deployment orchestrator

• Reduce DB loads for tags/owners to only the fields that are needed and skip unused relationships.
• Copy fast-path: skips bulk_validate_node_data entirely and uses pre-validated columns (this eliminates ANTLR4 type re-parsing for branch copies)
• Bulk flush per level when deploying nodes per level and per-dim link flush eliminated
• Reduce export load options: new Node.export_load_options() / NodeRevision.export_load_options() skip
  materializations, availability, and created_by
• Skip redundant session.refresh for owners

Column type caching

• Column type is now cached with lru_cache(maxsize=1024) so that repeated ANTLR4 parses for the same type
  string (e.g., bigint, float) are eliminated
• We pre-populate the cache with common primitive types at server startup, so DB loads for routine types cost zero ANTLR4 calls

Metrics instrumentation

Instrument some metrics for deployment

Test Plan

• PR has an associated issue: #
• make check passes
• make test shows 100% unit test coverage

Deployment Plan

[netlify]

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