Use PSC to access ClickHouse Cloud

What does this MR do?

This MR switches production to use the Private Service Connect link to access ClickHouse Cloud instead of going externally.

Basic connectivity test from Sidekiq and Webservice pods was successful.

Issue: https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/24569

Author Check-list

Please read the Contributing document and once you do, complete the following:

• Check if all of the following apply:
  • Assign to the correct reviewer per the contributing document
  • Apply the correct metadata per the contributing document
  • Link to related MRs for applying the changes on other environments
  • Link to related Chef changes
  • If necessary link to a Criticality 4 Change Request issue

Reviewer Check-list

• Check if all of the following apply:
  • Reviewed the diff jobs to confirm changes are as expected
  • No changes shown in the diffs not associated with this MR - This may require a rebase or further investigation

Applier Check-list

• Make sure there is no ongoing deployment for the affected envs before merging (see #announcements slack channel)