RFR: 8328670: Automate and open source few closed manual applet test [v2]

[Tejesh R]

On Thu, 21 Mar 2024 17:36:40 GMT, Abhishek Kumar <abhiscxk at openjdk.org> wrote:

>> Few manual closed applet test converted to automated and open sourced.
>
> Abhishek Kumar has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove getContentPane usage

Looks fine for me.

-------------

Marked as reviewed by tr (Committer).

PR Review: https://git.openjdk.org/jdk/pull/18428#pullrequestreview-1954354134