This refactors the `SyncAsWorkItem` concern and adds a
`SyncAsWorkItemError` to easily filter epic to work item syncing errors.
In addition, we added a custom logger for errors that could happen when
an epic gets synced as a work item.

The main "Configure Gitaly" page is getting too large.

Associated MR to add the new page to the sidebar:
https://gitlab.com/gitlab-org/gitlab-docs/-/merge_requests/4569

Restructures the content in the Configure GitLab Dedicated page as two separate topics.

- change to merge request approval policies

These are all over the place, but several are of interest to the
Chief of Staff team.

Makes my best guess at where these security links should point, now
that this part of the handbook has migrated.

We link to the product section of our handbook a LOT. This MR updates
some of the product links in the handbook to point to the new site.

As part of the migration, these links to legal-related subjects
should be updated to the new handbook site.

Changelog: changed
EE: true

Scoping down to a subdirectory should help us move these through
more quickly. Or, at least, do more sensible levels of search-and-
replace.

Drop the scope of this merge request to be nothing but changing
the URLs in the metadata to be correct, and then fixing any trailing
space problems so lefthook will pass.

That makes this first MR easier to review, and the remaining hits
are ones that we ACTUALLY need to review by hand.

Keep the link, to direct existing installations to the new limitation

Update format for admin and api docs