Arcade PR pipeline uploads GBs of pipeline artifacts unnecessarily

The Arcade PR pipeline takes over 1 hour to finish while it's doing some unnecessary things:
- Uploading 6 GB of pipeline artifacts that are not used (it is upload in the Test phase at the very end)
- Uploading 4 GB in the build phase where I don't think the artifacts are used for anything (needs to be verified)

Furthermore, when building the test phase, we send unit tests to 4 queues to test the Helix SDK. However, we build the tests 4 times even though we probably can only do it once, however, this does only takes several minutes so not a high priority