RFR: 8340311: JPackage app-image exe launches multiple exe's in JDK 22+ [v4]

[Alexey Semenyuk]

> Support `win.norestart` application property in jpackage .cfg file. If found in the .cfg file and set to `true`, it forces the Windows app launcher not to restart the launcher process.
> 
> Collateral changes to the tests:
>  - Added `WindowsHelper.killProcess()` to kill process by PID;
>  - Added `WindowsHelper.findAppLauncherPID()` that will return PIDs of the running app launcher processes for the given app launcher name. The implementation grabbed from `Win8301247Test` test;
>  - Rework `CfgFile` to make it R/W and capable of writing multiple instances of the same key;
>  - Added `JPackageCommand.ignoreFakeRuntime()` to ignore external runtime if it is a stub. Should speed up local test runs.

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

  Minor cleanup

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/21726/files
  - new: https://git.openjdk.org/jdk/pull/21726/files/d87a5a41..fdde7778

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21726&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21726&range=02-03

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/21726.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21726/head:pull/21726

PR: https://git.openjdk.org/jdk/pull/21726