RFR: 8356102: TestJcmdOutput, JcmdWithNMTDisabled and DumpSharedDictionary hs/tier1 tests fail on static-jdk

[Jiangli Zhou]

Please review the change to set `-Dcompile.jdk=<jdk>` when launching child processes in TestJcmdOutput, JcmdWithNMTDisabled and DumpSharedDictionary hs/tier1 tests.

These three tests fail on static-jdk as `jdk.test.lib.JDKToolFinder.getJDKTool()` fails to locate the `jcmd` tool. `JDKToolFinder.getJDKTool()` locates the requested tool from the path specified in 'test.jdk' system property first, then using the path specified in 'compile.jdk' system property. Currently when running jtreg tests on static-jdk, jtreg '-compilejdk' is set to a regular JDK binary. Populating the 'compile.jdk' system property from jtreg when creating the child process would allow `JDKToolFinder.getJDKTool()` (executing in the child process) to locate the tool from 'compile.jdk' path.

Tested all three tests on static-jdk. All three tests pass with the fix.

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Commit messages:
 - Set -Dcompile.jdk=<> in launched test process.

Changes: https://git.openjdk.org/jdk/pull/25018/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25018&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8356102
  Stats: 11 lines in 3 files changed: 6 ins; 2 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/25018.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25018/head:pull/25018

PR: https://git.openjdk.org/jdk/pull/25018