Second attempt at .gitlab/ci/glfm.gitlab-ci.yml

What does this MR do and why?

Second attempt at .gitlab/ci/glfm.gitlab-ci.yml

• First attempt from !101118 (merged) had to be reverted because it caused problems in FOSS and docs-only builds. See the revert MR which contains details on the failures here: !101453 (merged)).
• See original MR (CI for GLFM verification script (!101118 - merged)) for details on the original requirements for creating this job.

How to set up and validate locally

• See original MR (CI for GLFM verification script (!101118 - merged)) for how to validate original CI changes.

Not sure how to verify that this CI job config will no longer cause master failures on docs-only or FOSS builds, other than carefully inspecting new rules. Open to suggestions...

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.