Support dirty workload versions

[samuelallan72]

Sometimes a workload (probably more likely when testing candidate or edge releases) may not have a clean semantic version, but may have non-standard prerelease or build information. For example we observed workload version 19.2.0~git20240301.4c76c50 for ceph-mon on squid/candidate channel.

COU currently passes the versions directly to packaging.version.Version, which requires version strings to conform to PEP 440. So in this example, COU crashes with an InvalidVersion error.

COU should support comparing these dirty versions. This could be implemented by transforming them to something compatible with Version. Eg. in the case of the ceph-mon example here, it should strip the ~git.... postfix, so it can use 19.2.0 as the version to compare.