[Feature flag] Remove `project_import_level_configuration` feature flag
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Work on this issue](https://contributors.gitlab.com/manage-issue?action=work&projectId=278964&issueIid=371643) - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=371643) </details> <!--IssueSummary end--> <!-- Title suggestion: [Feature flag] Enable description of feature --> ## 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. <!-- Short description of what the feature is about and link to relevant other issues. --> ## 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: <!-- The checklist here is to help stakeholders keep track of the feature flag status --> - [ ] 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](https://docs.gitlab.com/ee/development/feature_flags/#changelog). - [ ] 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.
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