feat(nsis): add ShutdownBlockReasonCreate for blocking Win Shutdown prompt (#7251)

Use ShutdownBlockReasonCreate show better message why shutdown is blocked

Author: ptol

.changeset/olive-planets-grin.md

@@ -0,0 +1,5 @@
+---
+"app-builder-lib": minor
+---
+
+feat(nsis): add ShutdownBlockReasonCreate for blocking Windowns Shutdown alert/prompt

packages/app-builder-lib/templates/nsis/installSection.nsh

@@ -26,6 +26,9 @@ StrCpy $appExe "$INSTDIR\${APP_EXECUTABLE_FILENAME}"
     FindWindow $0 "#32770" "" $hwndparent $0
     GetDlgItem $0 $0 1000
     SendMessage $0 ${WM_SETTEXT} 0 "STR:$(installing)"
+
+    StrCpy $1 $hwndparent
+		System::Call 'user32::ShutdownBlockReasonCreate(${SYSTYPE_PTR}r1, w "$(installing)")'
   ${endif}
   !insertmacro CHECK_APP_RUNNING
 !else
@@ -104,4 +107,4 @@ ${endIf}
   ${andIf} ${Silent}
     !insertmacro doStartApp
   ${endIf}
-!endif
+!endif