As per d5d8e76b, any attempts to rename a container registry repository are blocked due to image signatures.

This is the first commit doing mainly 3 things:
1. create a new scope and allow users to use it
2. Have the JWTController respond correctly on this
3. Updates documentation to suggest usage of PATs

There is one gotcha, there will be no support for impersonation tokens, as this
seems not needed.

Fixes gitlab-org/gitlab-ce#19219

* implemented logging of project and system web hooks
* implemented UI for user area (project hooks)
* implemented UI for admin area (system hooks)
* implemented retry of logged webhook
* NOT imeplemented log remover

Clarify how the milestone percentage is calculated in the docs.
Include example image of milestone.

This reverts commit b0498c17

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/32218