RFR: 8293883: Add test/.classpath (Eclipse)

[Andy Goryachev]

On Thu, 15 Sep 2022 21:55:20 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

> Adding a tests/.classpath file to include tests/manual/controls source folder so Eclipse could see/execute manual tests there.
> 
> Also, I would rather move the sources there to a specific package (test.manual ?) instead of a default package. Any objections?
> edit: won't be done as a part of this PR.

@nlisker :
could you please review this small change, I wanted to publish a demo/manual test for the constrained resize policy in [JDK-8293119](https://bugs.openjdk.org/browse/JDK-8293119) to the mailing list?
thank you in advance!
-andy

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PR: https://git.openjdk.org/jfx/pull/901