Move cross-join yml to inside spec/ directory

Thong Kuahrequested to merge
mv_cross_join_yml_to_spec into master

What does this MR do?

Moves .cross-join-allowlist.yml to inside spec/ instead

In one of my MRs, I experience YAML invalid pipelines (e.g. https://gitlab.com/gitlab-org/gitlab/-/pipelines/363090877). This was because .cross-join-allowlist.yml didn't match anything in .code-backstage-patterns.

We could have added that file to .code-backstage-patterns but really this is a spec data so move this to inside spec/

Edited by Thong Kuah

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