Run tests on GDK on component changes

What does this MR do and why?

We rebuild the e2e GDK image when certain components are changed, but we didn't necessary run the e2e tests (e.g., this MR with a change related to workhorse: !128314 (merged)).

This fixes that so that if the image is rebuilt, the tests are run.

Test pipeline: https://gitlab.com/gitlab-org/gitlab/-/pipelines/960233505

MR acceptance checklist

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