Cleanup `utilize_finding_data` feature flag
<!-- Title suggestion: [Feature flag] Cleanup <feature-flag-name> --> ## Summary This issue is to cleanup the `utilize_finding_data` feature flag, after the feature flag has been enabled by default for an appropriate amount of time in production. ## Owners - Team: ~"group::threat insights" - Most appropriate slack channel to reach out to: `#g_govern_threat_insights` - Best individual to reach out to: `@minac` ## Expectations ### Cleaning up the feature flag <!-- The checklist here is to help stakeholders keep track of the feature flag status --> - [x] Create a merge request to remove `utilize_finding_data` feature flag. Ask for review and merge it. - [x] Remove all references to the feature flag from the codebase. - [x] Remove the YAML definitions for the feature from the repository. - [x] Create [a changelog entry](https://docs.gitlab.com/ee/development/feature_flags/#changelog). - [x] Ensure that the cleanup MR has been deployed to both production and canary. If the merge request was deployed before [the code cutoff](https://about.gitlab.com/handbook/engineering/releases/#self-managed-releases-1), the feature can be officially announced in a release blog post. - [x] `/chatops run auto_deploy status <merge-commit-of-cleanup-mr>` - [x] If not already done, clean up the feature flag from all environments by running these chatops command in `#production` channel: - [x] `/chatops run feature delete <feature-flag-name> --dev` - [x] `/chatops run feature delete <feature-flag-name> --staging` - [x] `/chatops run feature delete <feature-flag-name>` - [ ] Close this rollout issue.
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