CI: speed-up frontend tests on ci

[shamoon]

Proposed change

Speeds up frontend tests from ~8-9 minutes to ~4-5

Only other note about this is that I had to play with the download/upload artifact for the coverage files a bit. At the moment it downloads all artifacts (to keep it in one step) and then filters out backend coverage on upload to codecov. The download is still super fast (at this point only other artifact is docs) so seems OK. Alternatively we could have 4 steps for each frontend artifact but this seems cleaner. Of course welcome any improvements.

Unfortunately I didnt find anything (obvious) similar to this for the backend tests. Maybe if we figure out conditionally running tests in the future we can reap the full benefits of this.

Oh, and I also cleaned up some names etc =)

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (please explain): CI

Checklist:

• I have read & agree with the contributing guidelines.
• If applicable, I have included testing coverage for new code in this PR, for backend and / or front-end changes.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• If applicable, I have checked that all tests pass, see documentation.
• I have run all pre-commit hooks, see documentation.
• I have made corresponding changes to the documentation as needed.
• I have checked my modifications for any breaking changes.

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