RFR: 8361530: Test javax/swing/GraphicsConfigNotifier/StalePreferredSize.java timed out

[Phil Race]

This test takes an insane amount of time on some systems. I just saw it take 1,042 seconds to PASS on an x64 Mac.
It doesn't help that there are 3 @run commands.
But also it loops over L&Fs, fonts, etc, testing many component types and created 4.600 top level frames and 2,300 popups 

I don't think we need all 3 run commands and I think testing with one font is fine for this.

That would bring that successful run down to just under 3 minutes. 
And since each test is doing 1/3 of the work a slight reduction in timeout : 600 -> 420, seems appropriate.

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

Commit messages:
 - 8361530
 - StalePreferredSize.java

Changes: https://git.openjdk.org/jdk/pull/27200/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27200&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8361530
  Stats: 5 lines in 1 file changed: 0 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/27200.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27200/head:pull/27200

PR: https://git.openjdk.org/jdk/pull/27200