Enable error tracking on Staging for an internal project

Infrastructure services for error tracking:

1. PreProd environment (single Omnibus install) https://sentry.gitlab.net/gitlab/pregitlabcom/
2. Kas service https://sentry.gitlab.net/gitlab/kas/ (production service)
3. Release tools https://sentry.gitlab.net/gitlab/release-tools/ (tooling for deployment, used by Delivery)

Other backend applications that are not the main rails app:

4. version.gitlab.com
5. license.gitlab.com
6. customers.gitlab.com

It would be really nice to eventually enable this for GitLab.com error events but this will for sure overrun our rate limits.

Proposal

Once we are deployed in Production, we will enable error tracking for the following two projects:

• https://gitlab.com/gitlab-org/customers-gitlab-com/ (for Staging deployment)
• https://gitlab.com/gitlab-org/release-tools/