Simplify and improve qa gem caching setup
What does this MR do and why?
It seems we have a lot of cache misses which means jobs performing qa gem installs end up waisting time on reinstalls. Also there seems to be duplication of caching jobs across child pipelines.
Improve caching by:
- Update cache on default refs if lockfile is changed (schedules run too infrequently, with automated dependency bumps and merge result pipelines we will end up not having up to date cache rather often)
- Reduce cache job duplication and simplify logic
MR acceptance checklist
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