[0.68] Fix Secure Supply Chain compliance issues (#12386)

## Description

This PR backports PRs #9990, #11548 and #11855 to 0.68 to resolve Secure Supply Chain warnings.

### Type of Change
- Bug fix (non-breaking change which fixes an issue)

### Why
While 0.68-stable has no recent feature work / bug fixes, the CI and publish pipelines still run, but are failing due to these compliance requirements. These failures prevent us from monitoring if there are actual build issues with these versions.

### What
Fixed our usage of NuGet and NPM feeds to pass compliance tests.

## Screenshots
N/A

## Testing
N/A

## Changelog
Should this change be included in the release notes: no

.gitignore

@@ -33,6 +33,12 @@ node_modules
 # Optional REPL history
 .node_repl_history
 
+# No NPM config to pass CFS compliance
+.npmrc
+
+# We use yarn, not npm
+package-lock.json
+
 #React Native
 *AppPackages*
 *BundleArtifacts*

GuardianCustomConfiguration.json

@@ -0,0 +1,3 @@
+{
+    "Enabled": false,
+}

NuGet.Config

@@ -6,9 +6,7 @@
   </packageRestore>
   <packageSources>
     <clear />
-    <add key="Nuget.org" value="https://api.nuget.org/v3/index.json" />
+    <!-- Warning: Do not add/change the NuGet feeds here. To be compliant this repo must only rely on this single ADO feed. -->
+    <add key="react-native" value="https://pkgs.dev.azure.com/ms/react-native/_packaging/react-native-public/nuget/v3/index.json" />
   </packageSources>
-  <disabledPackageSources>
-    <clear />
-  </disabledPackageSources>  
 </configuration>

change/@react-native-windows-cli-81517eff-3586-4693-8d07-0ff6bd9710b0.json

@@ -0,0 +1,7 @@
+{
+  "type": "patch",
+  "comment": "[0.68] Compliance: Rename template Nuget.config files to stop triggering multi-feed warnings",
+  "packageName": "@react-native-windows/cli",
+  "email": "jthysell@microsoft.com",
+  "dependentChangeType": "patch"
+}

change/react-native-windows-14a87dda-f285-4cd4-8a0f-b5aa9543cb9f.json

@@ -0,0 +1,7 @@
+{
+  "type": "patch",
+  "comment": "[0.68] Fix Secure Supply Chain compliance issues",
+  "packageName": "react-native-windows",
+  "email": "jthysell@microsoft.com",
+  "dependentChangeType": "patch"
+}

change/react-native-windows-74880bf0-e7b0-4668-9148-3c7fbf28d4a9.json

@@ -0,0 +1,7 @@
+{
+  "type": "patch",
+  "comment": "[0.68] Compliance: Rename template Nuget.config files to stop triggering multi-feed warnings",
+  "packageName": "react-native-windows",
+  "email": "jthysell@microsoft.com",
+  "dependentChangeType": "patch"
+}

packages/@react-native-windows/cli/src/generator-windows/index.ts

@@ -343,7 +343,7 @@ export async function copyProjectTemplateAndReplace(
     const sharedProjMappings = [];
 
     sharedProjMappings.push({
-      from: path.join(sharedPath, projDir, 'NuGet.Config'),
+      from: path.join(sharedPath, projDir, 'NuGet_Config'),
       to: path.join(windowsDir, 'NuGet.Config'),
     });