RFR: 8368683: [process] Increase jtreg debug output maxOutputSize for TreeTest

[Roger Riggs]

TreeTest failure is intermittent, getting the complete output may help with the diagnosis.

Add maxOutputSize for ProcessHandle TEST.properties for the directory of ProcessHandle tests.

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Commit messages:
 - 8368683: [process] Increase jtreg debug output maxOutputSize for TreeTest

Changes: https://git.openjdk.org/jdk/pull/27501/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27501&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8368683
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/27501.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27501/head:pull/27501

PR: https://git.openjdk.org/jdk/pull/27501