RFR: 8370846: Support execution of mlvm testing with test thread factory [v2]

[Leonid Mesnik]

> The MainWrapper used test thread factory has generated lambda method. So the AbsentInformationException is expected.  The actual source path is not checked.
> 
> Tested by run mlvm tests with and without test thread factory.
> 
> Also
> jdk/test/lib/thread/TestThreadFactory.java
> updated to provide TestThreadFactory. isTestThreadFactorySet() 
> that could be used by tests instead of checking property "test.thread.factory" directly.

Leonid Mesnik has updated the pull request incrementally with one additional commit since the last revision:

  improved comment

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Changes:
  - all: https://git.openjdk.org/jdk/pull/28028/files
  - new: https://git.openjdk.org/jdk/pull/28028/files/bf057a58..660ec003

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28028&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28028&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/28028.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28028/head:pull/28028

PR: https://git.openjdk.org/jdk/pull/28028