Disable KAS by default in FIPS environments

What does this MR do?

KAS doesn't comply with FIPS (being tracked in &7933 (closed)). Hence, we should disable it by default in FIPS environments, while still giving the user control to manually enable it.

Testing

1. In a FIPS environment, install the gitlab-fips package from https://dev.gitlab.org/gitlab/omnibus-gitlab/-/pipelines/243115
2. Deploy GitLab.
3. See that gitlab-kas is not enabled.
4. Edit /etc/gitlab/gitlab.rb and add roles['application_role'] and run reconfigure.
5. See that gitlab-kas is still not enabled.
6. Repeat the test with gitlab-ee package from that pipeline in a non-FIPS environment and see that gitlab-kas is enabled by default for default, and when using application_role.

Related issues

Closes #6802

Checklist

See Definition of done.

For anything in this list which will not be completed, please provide a reason in the MR discussion

Required

• Merge Request Title, and Description are up to date, accurate, and descriptive
• MR targeting the appropriate branch
• MR has a green pipeline on GitLab.com
• Pipeline is green on dev.gitlab.org if the change is touching anything besides documentation or internal cookbooks
• trigger-package has a green pipeline running against latest commit

Expected (please provide an explanation if not completing)

• Test plan indicating conditions for success has been posted and passes
• Documentation created/updated
• Tests added
• Integration tests added to GitLab QA
• Equivalent MR/issue for the GitLab Chart opened