RFR: 8316017: Refactor timeout handler in PassFailJFrame [v3]

[Alexey Ivanov]

> Refactored timeout handling in PassFailJFrame:
> 
> 1. Managing the timer and formatting the time left is inside `TimeoutHandler` class.
> 2. The class handles timer events and updates the label accordingly.
> 
> This is implemented on top of #15665.

Alexey Ivanov has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 16 commits:

 - Merge master
 - Refactor failure reason
   
   Ensure the failure reason doesn't change after it's set.
   Removed 'failed' and 'timeout' fields:
   if failureReason is set, the test fails.
 - 8316017: Refactor timeout handler in PassFailJFrame
 - Remove trailing whitespace
 - Mark the Builder class final
   
   It's not supposed to be extended.
 - Amend message in window closing handler
   
   The WindowClosingHandler is used both for the instruction
   frame and for test UI windows.
   Also add blank lines to separate different parts of the class.
 - Use invokeOnEDT in getInstructionFrameBounds
 - Use functional style for disposing of windows
   
   Also clean up the doc for disposeWindows().
 - Use statically imported invokeAndWait and isEDT
 - Build functional test UI
   
   The Builder now provides a method to create test UI,
   PassFailJFrame automatically invokes the method reference
   on the EDT and then shows both the instruction frame and
   the test window.
 - ... and 6 more: https://git.openjdk.org/jdk/compare/c587211b...f590891b

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

Changes: https://git.openjdk.org/jdk/pull/15668/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15668&range=02
  Stats: 149 lines in 1 file changed: 92 ins; 33 del; 24 mod
  Patch: https://git.openjdk.org/jdk/pull/15668.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15668/head:pull/15668

PR: https://git.openjdk.org/jdk/pull/15668