RFR: 8305608: Change VMConnection to use "test.class.path"instead of "test.classes" [v2]

[Leonid Mesnik]

> Currently, VMConnection run debugee using "test.classes" as a classpath. It cause test failures when virtual thread factory (wrapper) is enabled and test is not located the same directory as TestScaffold.

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

  fix

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13339/files
  - new: https://git.openjdk.org/jdk/pull/13339/files/525f769f..ac9c64a8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13339&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13339&range=00-01

  Stats: 8 lines in 1 file changed: 0 ins; 2 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/13339.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13339/head:pull/13339

PR: https://git.openjdk.org/jdk/pull/13339