Switch FIPS downstream to integration-test

What does this MR do?

Now that Support non-root Dockerfiles in SAST integratio... (gitlab-org/gitlab#381209 - closed) see MR has shipped let's see if it works 🤞

• This actually increases coverage so we run FIPS against all integration-test projects, not just the single downstream

What are the relevant issue numbers?

gitlab-org/gitlab#366852 (closed)

Does this MR meet the acceptance criteria?

• Changelog entry added
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer