Run markdown_snapshot_spec.rb when needed

What does this MR do and why?

Related: Tracking Issue: Implement GLFM scripts per the ... (#361241 - closed)

Implements suggestion from !102244 (comment 1152819487) to ensure spec/requests/api/markdown_snapshot_spec.rb and ee/spec/requests/api/markdown_snapshot_spec.rb run when GLFM config files are changed.

References

See the GLFM Specification Guide development documentation for much more context on all of this work: https://docs.gitlab.com/ee/development/gitlab_flavored_markdown/specification_guide

Testing

Run tooling/bin/find_tests with appropriate input file parameter containing a GLFM config file, and ensure that both specs get properly identified in the output file.

tooling/bin/find_tests /tmp/changed.txt /tmp/matching.txt

Example:

MR acceptance checklist

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