RFR: 8286620: Create regression test for verifying setMargin() of JRadioButton [v4]

[Harshitha Onkar]

On Wed, 1 Jun 2022 16:29:49 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

> Shall the test be located in `test/jdk/javax/swing/JRadioButton/4380543/bug4380543.java` instead of `test/jdk/javax/swing/JRadioButton/bug4380543.java` ?
> 
> Usually, there's been a folder with bugid (`/4380543/`) for each test. Do we use the flat layout now?

@aivanov-jdk Recently we have started to use the latter and remove the extra folder (`/4380543/`)

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PR: https://git.openjdk.java.net/jdk/pull/8721