API changes for next major version

Something which is really annoying and should be fixed but we missed to do in 8.0

• Deprecate name parametrize in API https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2394
• Consistency in MR api routes - https://gitlab.com/gitlab-org/gitlab-ce/issues/11810
• Remove deprecated expires_at from ProjectSnippet API - https://gitlab.com/gitlab-org/gitlab-ce/issues/14156