[Feature flag] Remove project_import_level_configuration feature flag

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Summary

We no longer need the project_import_level_configuration feature flag as we are taking a different direction and not adding a configurable setting. We should therefore remove it.

Owners

• Team: Group::Import
• Most appropriate slack channel to reach out to: #g_manage_import
• Best individual to reach out to: @carlad-gl
• PM: @m_frankiewicz

Tasks:

• Create a merge request to remove <project_import_level_configuration> 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 included in the release package.
  • /chatops run release check <merge-request-url> <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 --staging --staging-ref --production
• Close this issue.