RFR: 8304501: Remove orphaned demo netbeans projects [v2]

[Phil Race]

On Tue, 28 Mar 2023 08:37:25 GMT, Eirik Bjorsnos <duke at openjdk.org> wrote:

> > These were demo/sample code in JDK 5.
> 
> @mrserb would you please confirm if your review approval applies to `SwingApplet` only or the whole PR? As it stands, it is not clear to me whether this PR is approved or not. Thanks!

I am pretty sure Alan was approving the whole lot of them.

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PR Comment: https://git.openjdk.org/jdk/pull/13098#issuecomment-1499858579