Add /-/ping endpoint (uncached) for Pingdom checks

Gonzalo Servatrequested to merge
add-ping-check-logic into main

This MR adds a /-/ping endpoint (for production) that goes uncached to the origin (R2) for the purposes of setting up a Pingdom check.

Related: https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/23877

Edited by Gonzalo Servat

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