Remove SPM changes from Runner.xcscheme

- Reset xcschemes file to clean main branch version
- Remove auto-generated Flutter framework preparation script
- Remove LLDB configuration changes added by SPM
- Keep scheme file free of environment-specific configuration

Author: ened

permission_handler_apple/example/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

@@ -5,24 +5,6 @@
    <BuildAction
       parallelizeBuildables = "YES"
       buildImplicitDependencies = "YES">
-      <PreActions>
-         <ExecutionAction
-            ActionType = "Xcode.IDEStandardExecutionActionsCore.ExecutionActionType.ShellScriptAction">
-            <ActionContent
-               title = "Run Prepare Flutter Framework Script"
-               scriptText = "/bin/sh &quot;$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh&quot; prepare&#10;">
-               <EnvironmentBuildable>
-                  <BuildableReference
-                     BuildableIdentifier = "primary"
-                     BlueprintIdentifier = "97C146ED1CF9000F007C117D"
-                     BuildableName = "Runner.app"
-                     BlueprintName = "Runner"
-                     ReferencedContainer = "container:Runner.xcodeproj">
-                  </BuildableReference>
-               </EnvironmentBuildable>
-            </ActionContent>
-         </ExecutionAction>
-      </PreActions>
       <BuildActionEntries>
          <BuildActionEntry
             buildForTesting = "YES"
@@ -44,7 +26,6 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      customLLDBInitFile = "$(SRCROOT)/Flutter/ephemeral/flutter_lldbinit"
       shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
       </Testables>
@@ -64,13 +45,11 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      customLLDBInitFile = "$(SRCROOT)/Flutter/ephemeral/flutter_lldbinit"
       launchStyle = "0"
       useCustomWorkingDirectory = "NO"
       ignoresPersistentStateOnLaunch = "NO"
       debugDocumentVersioning = "YES"
       debugServiceExtension = "internal"
-      enableGPUValidationMode = "1"
       allowLocationSimulation = "YES">
       <BuildableProductRunnable
          runnableDebuggingMode = "0">