[Feature flag] Cleanup import_rescue_query_canceled

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Summary

This issue is to cleanup the import_rescue_query_canceled feature flag, after the feature flag has been enabled by default for an appropriate amount of time in production.

This feature flag controls whether the system handles ActiveRecord::QueryCanceled errors during a direct transfer. When enabled, the system will automatically retry a few times if this error occurs. If disabled, it will not attempt any retries.

Introduced : Direct Transfer - Statement timeout causes missing records

MR : Optimise RelationObjectSaver to handle database timeouts during import

Rollout issue : [FF] import_rescue_query_canceled -- Enable this FF on production

Owners

• Team: #g_import
• Most appropriate slack channel to reach out to: #g_import
• Best individual to reach out to: @imjaydip
• PM: @carlad-gl

Stakeholders

Expectations

What might happen if this goes wrong?

Cleaning up the feature flag

• Specify in the issue description if this feature will be removed completely or will be productized as part of the Feature Flag cleanup
• Create a merge request to remove <feature-flag-name> feature flag. Ask for review and merge it.
  • Remove all references to the feature flag from the codebase.
  • Remove the YAML definitions for the feature from the repository.
  • Create a changelog entry.
• Ensure that the cleanup MR has been deployed to both production and canary. If the merge request was deployed before the code cutoff, the feature can be officially announced in a release blog post.
  • /chatops run auto_deploy status <merge-commit-of-cleanup-mr>
• Close the feature issue to indicate the feature will be released in the current milestone.
• If not already done, clean up the feature flag from all environments by running these chatops command in #production channel: /chatops run feature delete <feature-flag-name> --dev --pre --staging --staging-ref --production
• Close this rollout issue.