mimemagic replacement: for immediate backport

1. gitlab-org/gitlab!57434 (merged)
2. gitlab-org/gitlab!57421 (merged)
3. gitlab-org/gitlab!57387 (merged)
4. gitlab-org/gitlab!57443 (merged)
5. gitlab-org/gitlab!57458 (merged)
6. gitlab-org/gitlab!57516 (merged)
7. gitlab-org/gitlab!57463 (merged)
8. gitlab-org/gitlab!57487 (merged)

There can be no legal release of GitLab without above MRs. Please backport these MRs before any (critical) security release.

Related: #4054 (closed)

/cc @gitlab-org/release/managers @gitlab-com/gl-security/appsec