RFR: 8338668: Test javax/swing/JFileChooser/8080628/bug8080628.java doesn't test for GTK L&F [v2]

[Abhishek Kumar]

> This test should have failed with the [changeset](https://github.com/openjdk/jdk/pull/20612) proposed for [JDK-4795384](https://bugs.openjdk.org/browse/JDK-4795384) but it didn't because GTK look and feel isn't supported in headless environment.
> 
> Fix is to run the test with headful environment on linux platform. 
> 
> Tested in CI pipeline and link attached to JBS.

Abhishek Kumar has updated the pull request incrementally with one additional commit since the last revision:

  Review comment update

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/20671/files
  - new: https://git.openjdk.org/jdk/pull/20671/files/72677087..892a8437

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20671&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20671&range=00-01

  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/20671.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20671/head:pull/20671

PR: https://git.openjdk.org/jdk/pull/20671