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f260f1565e
This is a precursor to: - https://github.com/neondatabase/neon/pull/6185 While that PR contains big changes to neon_local and attachment_service, this PR contains a few unrelated standalone changes generated while working on that branch: - Fix restarting a pageserver when it contains multiple shards for the same tenant - When using location_config api to attach a tenant, create its timelines dir - Update test paths where generations were previously optional to make them always-on: this avoids tests having to spuriously assert that attachment_service is not None in order to make the linter happy. - Add a TenantShardId python implementation for subsequent use in test helpers that will be made shard-aware - Teach scrubber to read across shards when checking for layer existence: this is a refactor to track the list of existent layers at tenant-level rather than locally to each timeline. This is a precursor to testing shard splitting.