Add preload

Fix

ok

Write tests

test only postgresql

ok

add more test
;

Improve wording

Add changelog

Fix

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.

Partially addresses #47424.

Now we have a PipelineEntity which is a bit smaller, mostly in bytes
needing to send to the frontend. PipelineDetailsEntity is the default
for the PipelineSerializer, limiting the changes needed.

This commit also incorporates the review.

This helps to avoid conflicts with `Paginator` class that seems to be
used by some bundled libs.