Make code review compatible with group archive

What does this MR do and why?

Make code review archival compatible with group archive

This is an implentation with a feature flag as earlier it caused timeout because of !212575 (comment 2924387093)

Query Plans

For app/models/issue.rb:

• Old: https://console.postgres.ai/gitlab/gitlab-production-main/sessions/45626/commands/139838
• New: https://console.postgres.ai/gitlab/gitlab-production-main/sessions/45732/commands/140070

For app/models/concerns/issuable.rb:

• Old: https://console.postgres.ai/gitlab/gitlab-production-main/sessions/45626/commands/139839

with merge_request dashboard

• New: https://console.postgres.ai/gitlab/gitlab-production-main/sessions/46095/commands/140915

References

Closes #578814 (closed)

Before	After

How to set up and validate locally

MR acceptance checklist

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