<Swing Dev> RFR: 8233556: [TESTBUG] JPopupMenu tests fail on MacOS

[Prasanta Sadhukhan]

Please review test fix for issue seen to be failing in mach5 testing on macos.
The tests issue are not reproducible locally so it seems to be timing issue on slower mach5 macos systems.
Adjusted the timing issues in these tests by using waitForIdle, delay and also uses Robot instead of ExtendedRobot which allows us to set autoDelay to more consistent 100ms.
Also, corrected the bugid of JPopupMenu/4634626

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

Commit messages:
 - 8233556: [TESTBUG] JPopupMenu tests fail on MacOS

Changes: https://git.openjdk.java.net/jdk/pull/882/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=882&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8233556
  Stats: 32 lines in 4 files changed: 11 ins; 8 del; 13 mod
  Patch: https://git.openjdk.java.net/jdk/pull/882.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/882/head:pull/882

PR: https://git.openjdk.java.net/jdk/pull/882