Fixes #19775 - Fix Layout/ExtraSpacing cop

Refs #18675 - Optionally load prometheus exporter

In case the bundler group telemetry is not installed, we should handle
that.

This moves the middleware loading to better match the other middleware.

Fixes #18675 - telemetry foreman API

fixes #1463 - let Foreman run on a sub path

e.g. for it being available on http://localhost:3000/foreman you run:

RAILS_RELATIVE_URL_ROOT=/foreman rails s

WIP rails3 migration