RFR: 8284993: Replace System.exit call in swing tests with RuntimeException [v3]

[Alexander Zvegintsev]

On Wed, 20 Apr 2022 10:46:01 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

>> Few swing tests call System.exit() which might stop the test harness from executing further tests if any of the test fail. We should replace with RuntimeException.
>
> Prasanta Sadhukhan has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Test fix

Marked as reviewed by azvegint (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/8293