Add indexed_at and schema_version to KG replica

Jan Provaznikrequested to merge
jp-replica-indexed into master

What does this MR do and why?

Adds indexed_at and schema_version to KG replica. Knowledge graph schema version is also stored for each zoekt node: then we can periodically check for KG replicas which have version smaller than zoekt node KG version and schedule re-index of the repository (see gitlab-org/rust/knowledge-graph#9 (comment 2625512872) for details).

zoekt-indexer counterpart MR which will be merged later: gitlab-zoekt-indexer!570 (merged)

References

Related to #548463 (closed)

Related to gitlab-org/rust/knowledge-graph#9 (comment 2625512872)

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How to set up and validate locally

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Edited by Jan Provaznik

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