Remove basic warn-mode
What does this MR do and why?
This removes the basic-warn-mode feature introduced in !177175 (merged). We are working on a new warn-mode feature and want to avoid confusion with the old feature. The feature flag was never enabled by default or turned on globally on GitLab.com.
Note: we can't remove the entire feature flag because the new feature uses the same one.
⚠️ Note
We are using a basic-warn mode policy for gitlab-org. I've created an MR to disable it but disabling this feature will not make any previous warn mode policies enforced as the approvers is still set to 0.
Also, the basic-warn mode policy for gitlab-org only applies to a sub-group only used by an internal team for dogfooding, so it will not affect gitlab.com
- MR to disable policy on gitlab-org: https://gitlab.com/gitlab-org/gitlab-org-security-policy-project/-/merge_requests/35
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Related to #578509