Merge branch '457518-nwittstruck-protected-containers-rest-api-post-protection-rule' into 'master'

Protected containers: Add POST to REST API for container protection rules

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/157925



Merged-by: Alejandro Rodríguez <alejandro@gitlab.com>
Approved-by: Thomas Hutterer <thutterer@gitlab.com>
Approved-by: Marcel Amirault <mamirault@gitlab.com>
Approved-by: Alejandro Rodríguez <alejandro@gitlab.com>
Reviewed-by: Marcel Amirault <mamirault@gitlab.com>
Co-authored-by: Nicholas Wittstruck <nicholas@b310.de>
Co-authored-by: Nicholas <1494491-nwittstruck@users.noreply.gitlab.com>