RFR: 8355002: Clean up some mentions of "applet" in tests

[Sergey Bylokhov]

On Thu, 17 Apr 2025 21:40:34 GMT, Phil Race <prr at openjdk.org> wrote:

> This PR cleans up obsolete references to "applet" meaning
> - the word applet in a comment where its not relevant (any more)
> -  extraneous imports of the applet package or an applet class
> -  obsolete methods which check for applet
> - an exception handling case that isn't needed.
> 
> After this applet/Applet still appears in tests that test the Applet API but that's expected.
> 
> There's also a few tests that mention applets but aren't applet-specific and require more time than this quick clean up of most mentions.

Marked as reviewed by serb (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/24744#pullrequestreview-2777369247