[jdk21u-dev] RFR: 8367772: Refactor createUI in PassFailJFrame

[Roland Mesde]

Backporting 8367772: Refactor createUI in PassFailJFrame.

This PR refactors PassFailJFrame UI creation to use Builder pattern internally, eliminating parameter proliferation and code duplication.

For parity with Oracle JDK. Already backported to 25.

Ran a manual test that uses the PassFailJFrame on macos-aarch64:

~/github/jtreg/build/images/jtreg/bin/jtreg -jdk build/macosx-aarch64-server-release/images/jdk -m test/jdk/java/awt/Dialog/ModalDialogTest/ModalDialogTest.java

ScreenShots:

<img width="1416" height="508" alt="Step1" src="https://github.com/user-attachments/assets/9d1e6eb6-242f-428e-84a0-e2350284ba59" />
<img width="1425" height="641" alt="Step2" src="https://github.com/user-attachments/assets/d19d338f-cb2c-4b98-8dc1-d1988cada043" />
<img width="1404" height="848" alt="Step3" src="https://github.com/user-attachments/assets/7708ca9b-78f4-487e-b932-b2969b5168f1" />

Results:

[ModalDialogTest-Success.jtr.txt](https://github.com/user-attachments/files/25496112/ModalDialogTest-Success.jtr.txt)

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Commit messages:
 - Backport d278043ddba0cd9ec3ddf8b490366965f5831a22

Changes: https://git.openjdk.org/jdk21u-dev/pull/2628/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2628&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367772
  Stats: 55 lines in 1 file changed: 8 ins; 33 del; 14 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2628.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2628/head:pull/2628

PR: https://git.openjdk.org/jdk21u-dev/pull/2628