[Feature flag] Enable compliance violations report

What does this MR do and why?

This MR removes the compliance_violations_report feature flag from the codebase. It also updates the following:

• Updates the documentation to remove the documentation about the old dashboard.
• Updates the approval-status-and-separation-of-duties links as there is no reference to approval status anymore.
• Move merge_commits_export_button.vue to the shared/ folder in preparation for the old code removal and because it makes more sense.

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• The deletion of the unnecessary mappers has been moved to !84357 (merged)
• The deletion of the old code has been moved to !83964 (merged)

Screenshots or screen recordings

How to set up and validate locally

1. Go to [GDK_HOST]/groups/[GROUP]/-/security/compliance_dashboard
2. Validate that the violations are shown
   • If no violations are shown then you can run FILTER=compliance_report_violations rake db:seed_fu to populate violations locally

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to [Feature flag] Enable compliance violations report (#346266 - closed)