E2E: use more descriptive variable name for gitlab version variable
What does this MR do and why?
Use a more descriptive variable name in order to not clash with potential parent pipelines. For example GITLAB_VERSION
is used in omnibus project but it's not necessarily a semver version, it can also be a commit sha and we even override it in trigger-omnibus job.
This should fix potential problems and also have a more precise rule when not to run update job to reduce confusing failures
MR acceptance checklist
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