RFR: 8075917: The regression-swing case failed as the text on label is not painted red with the GTK L&F

[Abhishek Kumar]

JLabel text is not painted with the LAF defined foreground color in GTK LAF. In GTK LAF the foreground color is retrieved by using native system APIs. Fix is to return the foreground color if it is set by LAF defined property otherwise return the default color by calling native APIs.
Applet based test has been converted to automatic test and check for all installed LAFs. CI testing is green for test suite and individual test. Link attached in JBS.

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

Commit messages:
 - JLable foreground color fix for GTK LAF

Changes: https://git.openjdk.org/jdk/pull/17763/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17763&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8075917
  Stats: 131 lines in 2 files changed: 131 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/17763.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17763/head:pull/17763

PR: https://git.openjdk.org/jdk/pull/17763