Add go.uber.org/automaxprocs/maxprocs to handle GOMAXPROCS

What does this MR do?

Add go.uber.org/automaxprocs/maxprocs to handle GOMAXPROCS

It follows the pattern used by other services and described in Discussion: Standardise GOMAXPROCS across all G... (gitlab#402233)

Closes gitlab-com/gl-infra/production-engineering#25104 (closed)

TODO

• Feature flag
  • Added feature flag:
  • This feature does not require a feature flag
• I added the Changelog trailer to the commits that need to be included in the changelog (e.g. Changelog: added)
• I added unit tests or they are not required
• I added acceptance tests or they are not required
• I added documentation (or it's not required)
• I followed code review guidelines
• I followed Go Style guidelines