Merge branch 'docs-redirects2-ee' into 'master'

Docs: Add missing redirects to /user docs (Only EE Docs)

See merge request gitlab-org/gitlab-ee!9873

doc/user/project/ci_cd_for_external_repo.md

+---
+redirect_to: '../../ci/ci_cd_for_external_repos/index.md'
+---
+
 This document was moved to [another location](../../ci/ci_cd_for_external_repos/index.md).

doc/user/project/maven_packages.md

 ---
 redirect_to: 'packages/maven_repository.md'
 ---
+
+This document was moved to [another location](packages/maven_repository.md).

doc/user/project/merge_requests/sast_docker.md

-This document was moved to [another location](./container_scanning.md).
\ No newline at end of file
+---
+redirect_to: 'container_scanning.md'
+---
+
+This document was moved to [another location](container_scanning.md).

doc/user/project/packages/maven.md

+---
+redirect_to: 'maven_repository.md'
+---
+
 This document was moved to [another location](maven_repository.md).

doc/user/project/packages/maven_packages.md

+---
+redirect_to: 'maven_repository.md'
+---
+
 This document was moved to [another location](maven_repository.md).