Add link to our experiences with --no-tags

What does this MR do?

In gitlab-com/gl-infra/scalability#746 we learned that for our own CI pipelines on gitlab-org/gitlab, the --no-tags Git fetch option made a big difference in Gitaly server CPU utilization.

This MR adds a documentation reference to that scalability issue to our CI documentation in the section that has advice for large repositories.

Screenshots (strongly suggested)

Does this MR meet the acceptance criteria?

Conformity

Availability and Testing

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

  • Label as security and @ mention @gitlab-com/gl-security/appsec
  • The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
  • Security reports checked/validated by a reviewer from the AppSec team

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