[core-kit] [kernel] sys-kernel/debian-sources generator includes pre-release versions of openzfs in compat. check

[cuantar]

The result is an inconsistent state: We don't have a debian-sources version that matches our openzfs. The cause of the bug is the way the compatibility check is performed, by examining a file META downloaded directly from the openzfs Github repository. The generator is using the master branch for this check, but should instead be using the latest tag, since that's what we're autogenning from.

So, the generator will need additional logic to acquire the tags and pick out the correct one, and then construct the URL for META file.