RFR: 8347173: java/net/DatagramSocket/InterruptibleDatagramSocket.java fails with virtual thread factory [v2]

[Jaikiran Pai]

> Can I please get a review for this test-only change which proposes to skip this test when the `main()` is launched through a virtual thread?
> 
> This test was introduced in https://bugs.openjdk.org/browse/JDK-8233018 , before virtual threads were introduced. In its current form the test doesn't take into account the specification of `DatagramSocket.receive()` when a virtual thread is doing the `receive()`. There's already the `test/jdk/java/net/vthread/BlockingSocketOps.java` test which exercises the `receive()` through a virtual thread and verifies its specified behaviour, so we can skip this `InterruptibleDatagramSocket` test when a virtual thread is involved.
> 
> With the proposed change, the test no longer fails and is reported as skipped by jtreg.

Jaikiran Pai has updated the pull request incrementally with one additional commit since the last revision:

  Alan's review - update skip reason

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23074/files
  - new: https://git.openjdk.org/jdk/pull/23074/files/0ef6f8e8..e0ab91c3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23074&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23074&range=00-01

  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/23074.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23074/head:pull/23074

PR: https://git.openjdk.org/jdk/pull/23074