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migrations: Read and validate createIndexConcurrently from metadata.yaml

Administrator requested to merge ef/mark-concurrent-migrations into main

Created by: efritz

Pulled from #29831. This PR reads createIndexConcurrently from migration metadata and validates that:

  • all migrations that create an index concurrently marks this in their metadata,
  • if a migration marks this in their metadata, the migration must contain a create index concurrently statement, and
  • no migrations create index concurrently on downgrades (old behavior)

Migration definitions with this flag will also have a IndexMetadata value indicating the target table and index name. This will be required later when we handle these types of migration specifically (outside of a shared lock). As part of the migration sequence, we'd like to be able to automatically drop and recreate invalid indexes - this information will be necessary.

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