Ref: Run sample update concurrently

[lucas-zimerman]

Previously the tests of bumping the samples and testing the build was run sequentially, due to the amount of samples we are using the CI for building PRs was getting slower.

The PR implements two changes:

• Github Actions: a vm for each test, and reuse of the built capacitor package.
• Local: use the concurrency dependency allowing to build and test all samples in parallel.
  I tried using the concurrency and similar methods to only use a single VM on Github Actions but yarn seems too unstable when installing from multiple sources at the same time so I opted for using the simpler version of just using multiple macos virtual machines.

Measured time: before : 8 minutes, after: 1 minute 30 seconds

• Minor change:
• moved the build job to the top since the below jobs depends on it (just a visual change)

#skip-changelog

[krystofwoldrich]

LGTM 🚀

Just some small nits about white spaces.