ci: Make `setup-test-env` optionally need `update-gitaly-binaries-cache`

Rémy Coutablerequested to merge
add-optional-needs-for-setup-test-env into master

In the pipelines where update-gitaly-binaries-cache runs, setup-test-env should wait for it so it can take advantage of the cache built by update-gitaly-binaries-cache.

Edited by Rémy Coutable

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