Test components on the fly

[vigoo]

As we have more and more conflicts on the test-component WASMs, and now they are all compiled with golem itself unlike in the past, this PR experiments with:

• removing them from the repo
• single cargo make command to build them for yourself for local testing
• CI builds them in parallel and passes to the test jobs
• also refactored the CI yamls to use composable actions for the redundant parts (just learned about this yesterday)

Adds ~2min to the total CI run time, can be easily scaled more (already a matrix job)

For the unrelated property based test fix see https://ampcode.com/threads/T-019d0cb5-f06b-769c-bf76-d915d02ce004