Include gdk pipeline yml in ci-qa-patterns

What does this MR do and why?

Includes the configuration for the test-on-gdk child pipeline in ci-qa-patterns so that the pipeline will run if there are changes to its configuration.

Test results

Test pipeline https://gitlab.com/gitlab-org/gitlab/-/pipelines/894421448 on a change to .gitlab/ci/test-on-gdk/main.gitlab-ci.yml in !123102 (closed)

MR acceptance checklist

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