cloud: feat(schema): do schema versioning and make backup non-blocking for i… #7856
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…ndexing (#7852)
Issue:
We used to write schema/types at timestamp=1. That single bit violates the Snapshot Isolation. Hence, we couldn't run schema updates and other operations like backup concurrently. This is an issue in a multi-tenant cluster because if the backup is running we couldn't update the schema.
Fix:
This PR writes the schema/types at the startTs of the transaction and enables the schema updates to be made even if the backup is running.
(cherry picked from commit f376a40)
This change is