RFR: 8319158: Parallel: Make TestObjectTenuringFlags use createTestJavaProcessBuilder

[Leo Korinth]

Tested with:
`make run-test TEST=jtreg:test/hotspot/jtreg/gc/arguments/TestObjectTenuringFlags.java JTREG='VERBOSE=all;JAVA_OPTIONS='` -> pass 1
`make run-test TEST=jtreg:test/hotspot/jtreg/gc/arguments/TestObjectTenuringFlags.java JTREG='VERBOSE=all;JAVA_OPTIONS=-XX:+UseSerialGC'` -> pass 0
`make run-test TEST=jtreg:test/hotspot/jtreg/gc/arguments/TestObjectTenuringFlags.java JTREG='VERBOSE=all;JAVA_OPTIONS=-XX:+NeverTenure'` -> pass 0 

I will later (before integrating) run this test together with more tests through high tier testing to see that we do not fail when rotating flags.

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Commit messages:
 - 8319158: Parallel: Make TestObjectTenuringFlags use createTestJavaProcessBuilder

Changes: https://git.openjdk.org/jdk/pull/16432/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16432&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319158
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/16432.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16432/head:pull/16432

PR: https://git.openjdk.org/jdk/pull/16432