fix: Multiple gRPC `Create/Init/Destroy` cycles causes multiple plugg……able-discovery zombie process (#2985)* Refactor mocked-discovery integration tests* Added integration-test to check handling of multiple discovery instances* Correctly clean-up pluggable-discoveries on gRPC instance close

Move the "debian package" copyright file into the correct folder (#2955)* Move the copyright file into the correct folder* Fix the location of the copyright file* fix debian in correct location---------Co-authored-by: Alessio Perugini <alessio@perugini.xyz>

Fixed release workflow build

[skip-changelog] Investigate some integration-test failures (increase…… debugging prints) (#2844)

[skip changelog] Renamed FQBN.Packager -> FQBN.Vendor (#2836)