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

[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.

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Commit messages:
 - fix order of modifiers
 - fix order of modifiers
 - fix order of modifiers
 - Merge branch 'master' into JDK-8340311
 - Better function names
 - - CfgFile can store multiple kvp-s with the same key names
 - - CfgFile turned R/W from R/O
 - Remove trailing whitespaces
 - Reduce number of CfgFile copies
 - 8340311: JPackage app-image exe launches multiple exe's in JDK 22+

Changes: https://git.openjdk.org/jdk/pull/21726/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21726&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340311
  Stats: 536 lines in 13 files changed: 386 ins; 88 del; 62 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