RFR: 8370851: Mark hotspot and jdk tests incompatible with test thread factory

[Serguei Spitsyn]

On Tue, 28 Oct 2025 23:30:52 GMT, Leonid Mesnik <lmesnik at openjdk.org> wrote:

> There are some tests not compatible with with test thread factory. They are marked with corresponding requires tag.
> 
> Currently, the only "Virtual" test thread factory exist. It tries to start threads as virtual threads.
> 
> The tests that are incompatible with test thread factory are marked with
> test.thread.factory == null
> and the tests that are rather incompatible with virtual threads are makred
> with
> test.thread.factory != "Virtual"

This looks good to me modulo the comment from Alan.

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Marked as reviewed by sspitsyn (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/28030#pullrequestreview-3396935258