Solve unreliable tests (#1266)

* Fix unreliable test.
Random could be randomly 0 which would fail the test.

* Create types for buildflavors to prevent string comparison.
Use these build variants for specific tests.

* Don't assign the times variable to a final value as it breaks tests.
Until refactored, it's okay to recalculate this.

* Remove a few sonar code smells.

* Fix broken instrumentation test for key verification.
Add matching binary, signature and pubkey from pod.