RFR: 8319326: GC: Make TestParallelRefProc use createTestJavaProcessBuilder

[Ramkumar Sunderbabu]

Testing:
HS Tiers 1 and 2 
Ran with all flag combinations in CI

-------------

Commit messages:
 - 8319326: GC: Make TestParallelRefProc use createTestJavaProcessBuilder

Changes: https://git.openjdk.org/jdk/pull/28508/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28508&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319326
  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/28508.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28508/head:pull/28508

PR: https://git.openjdk.org/jdk/pull/28508