Improve score comparison to avoid violating Comparator contract in System Search

[wweellddeerr]

What does this PR change?

This PR fixes the following error in system search: java.lang.IllegalArgumentException: Comparison method violates its general contract!

The previous approach used Math.abs(score1 - score2) < .001 to account for slight differences, which could lead to inconsistent results in certain situations. For example, if score1 is slightly less than score2 but within the .001 threshold, the method would treat them as equal. However, if score2 is compared to another score, score3, that is just slightly more than .001 greater than score1, the transitive property required by the general contract of compareTo would be violated, leading to scenarios where A > B, B > C, and A < C, which is inconsistent.

GUI diff

No difference.

• [x] DONE

Documentation

• No documentation needed: bug fix.

• [x] DONE

Test coverage

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• Unit tests were added

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• [x] DONE

Links

Issue(s): https://github.com/SUSE/spacewalk/issues/24953

• [ ] DONE

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