HMS-10986: fix maven counts

[TenSt]

This PR:

• Fixes Maven package_count from .jar files instead of .pom
• Fixes Maven build_count to count distinct full versions, not jar files
• Fixes Maven version_count to count distinct base versions (strips .rhlw-XXXX)
• Updates integration fixture to use release-qualified version paths
• Adds unit tests for rhlw and standard .Final version counting

[ochosi]

I've reviewed the two parts that seem to matter most in this PR:

• the adjusted SQL statement
• the regular expression

Both make sense to me and should move us over to counting based on .jar files.

I will admit I did not review the tests.