RFR: 8365790: Shutdown hook for application image does not work on Windows [v5]

[Alexey Semenyuk]

> Disable the default handling of Ctrl+C in the parent app launcher process to let the child app launcher running JVM handle it. Add corresponding test case.
> 
> The new test is crafted to work (skip) in the environment where Ctrl+C signal emitted from the PowerShell script doesn't go through to a child process.
> 
> Supplementary changes:
>  - Added convenience api to CfgFile;
>  - Fixed `TKit.waitForFileCreated()` function to work correctly when multiple files are monitored in the same directory and to call `close()` on the WatchService instance.

Alexey Semenyuk has updated the pull request incrementally with one additional commit since the last revision:

  Call close() of a watch service instance

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/27264/files
  - new: https://git.openjdk.org/jdk/pull/27264/files/d8ad4975..c63a7582

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27264&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27264&range=03-04

  Stats: 38 lines in 1 file changed: 4 ins; 4 del; 30 mod
  Patch: https://git.openjdk.org/jdk/pull/27264.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27264/head:pull/27264

PR: https://git.openjdk.org/jdk/pull/27264