[jdk11u-dev] RFR: 8290469: Add new positioning options to PassFailJFrame test framework

[Goetz Lindenmaier]

I backport this for parity with 11.0.21-oracle.

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Commit messages:
 - Backport 62140e249cf78d8d4acd1e5ab76bac0cc013a1a5

Changes: https://git.openjdk.org/jdk11u-dev/pull/2250/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2250&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290469
  Stats: 196 lines in 7 files changed: 118 ins; 36 del; 42 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2250.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2250/head:pull/2250

PR: https://git.openjdk.org/jdk11u-dev/pull/2250