(refactor): clean up child processes on cancel

src/UScheduler/BackgroundServices/PSScriptBackgroundService.cs

@@ -51,10 +51,13 @@ namespace UScheduler.BackgroundServices {
         // When the stopping token is canceled, for example, a call made from services.msc,
         // we shouldn't exit with a non-zero exit code. In other words, this is expected...
         _logger.LogInformation("Stopping PSScriptBackgroundService due to cancellation request");
+        _psScriptService.TerminateAllScripts();
       }
       catch (Exception ex) {
         _logger.LogError(ex, "{Message}", ex.Message);
 
+        _psScriptService.TerminateAllScripts();
+
         // Terminates this process and returns an exit code to the operating system.
         // This is required to avoid the 'BackgroundServiceExceptionBehavior', which
         // performs one of two scenarios:

src/UScheduler/BackgroundServices/ProcessBackgroundService.cs

@@ -55,10 +55,13 @@ public sealed class ProcessBackgroundService : BackgroundService {
       // When the stopping token is canceled, for example, a call made from services.msc,
       // we shouldn't exit with a non-zero exit code. In other words, this is expected...
       _logger.LogInformation("Stopping ProcessBackgroundService due to cancellation request");
+      _processService.TerminateAllProcesses();
     }
     catch (Exception ex) {
       _logger.LogError(ex, "{Message}", ex.Message);
 
+      _processService.TerminateAllProcesses();
+
       // Terminates this process and returns an exit code to the operating system.
       // This is required to avoid the 'BackgroundServiceExceptionBehavior', which
       // performs one of two scenarios: