Refactor spam validation to a concern that can be easily reused and improve legibility in `SpamCheckService`

NotesHelper#note_editable? and ProjectTeam#human_max_access currently
take about 16% of the load time of an issue page. This MR preloads
the maximum access level of users for all notes in issues and merge
requests with several queries instead of one per user and caches
the result in RequestStore.

A release's tag reference is just the name of the tag, not the entire
tag object.

This also fixes the tags index if a tag's message contains non-UTF8 byte
sequences.

* Registered video MIME types
* Currently supporting browser-supported formats with extensions that match the mime type

Remove builds settings from project settings; add builds settings route; add new controller action; put badge stuff under builds settings controller action

Manual actions are accessible from:
- Pipelines
- Builds
- Environments
- Deployments

Add Pending Tab to Project Builds

Update CHANGELOG

This reverts commit 530f5158.

See !4892.
Signed-off-by: NRémy Coutable <remy@rymai.me>

Closes #19573

fixies #19747

This reverts commit c3935699.

This reverts commit 9ca633eb, reversing
changes made to fb229bbf.

- Cherry-picked from `mvestergaard:branch-protection-dev-merge`
- https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/4220