Improve sources / targets labels that are being passed in prompts

[pranavgaikwad]

Right now, we are passing in labels that come from rules as-is. We have to improve that because sometimes irrlevant potentially confusing labels can be passed. We have to evaluate whether:

1. we can pass labels that come out of label selector (special attention to ! operator)
2. test the effect of labels that have a hierarchical relationship like going from javax -> jakarta, then from jakarta -> quarkus, etc.
3. evaluate the effect of source labels