Remove license check approval frontend

What does this MR do and why?

Describe in detail what your merge request does and why.

Remove license check approval frontend

• remove license check feature
• remove docs
• backend being done in a separate MR (https://gitlab.com/gitlab-org/gitlab/-/compare/master...397067-prepare-removal-of-license-check-feature?from_project_id=278964&straight=false)
• License Compliance Policies being removed in Remove license compliance policies tab (!116814 - merged)
• Fix coverage-check popover

Changelog: removed

EE: true

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

Page	Before	After
/-/settings/merge_requests Merge Request Approvals
/-/merge_requests/:id License-Check Approval
Coverage Check popover

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Navigate to http://gdk.test:3443/mixed-vulns/security-reports-all/-/settings/merge_requests => Merge Request Approvals
2. Verify License check isn't an option by default
3. Create an MR and navigate to it
4. Verify the MR approval widget does not have License Check as an option

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 #397067 (closed)

Related to #403207 (closed)