RFR: 8306575: Clean up and open source four Dialog related tests [v2]

[Alexey Ivanov]

On Mon, 24 Apr 2023 18:41:27 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

> invokeLater may not be executed before the test stops by the jtreg, EDT could be killed at that point. It is better to use invokeAndWait or somehow make sure it will ends.

Totally agree.

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PR Review Comment: https://git.openjdk.org/jdk/pull/13592#discussion_r1175667904