Partially addresses #47424.

This whitelists all existing offenses for the various CodeReuse cops, of
which most are triggered by the CodeReuse/ActiveRecord cop.

This adds a database migration that creates routes for any projects and
namespaces that don't already have one. We also remove the runtime code
for dynamically creating routes, as this is no longer necessary.

These extra sort keys caused sequential scans on the namespaces and projects
page. Removing them makes the page load on GitLab.com.

Closes #44338

Closes #35994