Fix gitaly setup running always for specs setup

Thong Kuahrequested to merge
fix_setup_env_for_sha_based_gitaly into master

What does this MR do?

Resolves #229736 (closed)

Since we switched to shas in GITALY_SERVER_VERSION, it no longer matches the VERSION in gitaly. As we cannot update VERSION as that is in another project, we match GITALY_SERVER_VERSION against checked out git sha instead, in order to determine if we need to run gitaly setup again

Edited by Thong Kuah

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