Updating tests and proof solution for palindrome-products

[jagdish-15]

Pull Request: Update Test Suite for Palindrome-Products Exercise

This pull request updates the test suite for the Palindrome-Products exercise to align it with the latest problem specification.

Key Changes

• The test suite now incorporates the updated cases from the latest specification.
• The old proof solution has been replaced with the one published by @Cool-Katt, as the previous solution assumed the smallest product was always derived from the smallest factor—a scenario specifically addressed by the new test cases.
• @Cool-Katt has been added to the contributors' list in acknowledgement of their solution contribution.

Please review the changes and let me know if further adjustments are needed.

[github-actions]

This PR touches files which potentially affect the outcome of the tests of an exercise. This will cause all students' solutions to affected exercises to be re-tested.

If this PR does not affect the result of the test (or, for example, adds an edge case that is not worth rerunning all tests for), please add the following to the merge-commit message which will stops student's tests from re-running. Please copy-paste to avoid typos.

[no important files changed]

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[github-actions]

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[Cool-Katt]

@jagdish-15 was the old CI failing?

[jagdish-15]

@Cool-Katt, yes, the old CL was failing, as explained above!