RFR: 8323717: Introduce test keyword for tests that need external dependencies

[Aleksey Shipilev]

On Tue, 23 Jan 2024 14:42:20 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

> Is there any place to document the new keyword or its usage; it does not seem very discoverable just existing in the TEST.ROOT and some tests.

I don't think there is a place to describe keywords, except in the relevant `TEST.ROOT`-s.

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PR Comment: https://git.openjdk.org/jdk/pull/17421#issuecomment-1906324934