RFR: 8359889: java/awt/MenuItem/SetLabelTest.java inadvertently triggers clicks on items pinned to the taskbar [v2]

[Manukumar V S]

> Issue:
> In Windows, java/awt/MenuItem/SetLabelTest.java inadvertently triggers clicks on items pinned to the taskbar. This may open some other UI item and may interfere further testing on that machine.
> 
> Fix:
> Move the test UI to the centre of the screen by calling frame.setLocationRelativeTo(null).
> 
> Testing:
> Tested manually and using Mach5(20 times in 3 machines) and got all PASS and never triggered unwanted clicks on taskbar.

Manukumar V S has updated the pull request incrementally with one additional commit since the last revision:

  Copyright changes

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Changes:
  - all: https://git.openjdk.org/jdk/pull/25868/files
  - new: https://git.openjdk.org/jdk/pull/25868/files/25a679de..92179537

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25868&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25868&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/25868.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25868/head:pull/25868

PR: https://git.openjdk.org/jdk/pull/25868