chore: add Azure site extension web.config X-Frame-Options header (#3522)

Add X-Frame-Options header to web.config

Author: nr-ahemsath

build/Packaging/AzureSiteExtension/Content/web.config

@@ -9,5 +9,10 @@
     <staticContent>
       <mimeMap fileExtension=".log" mimeType="text/plain" />
     </staticContent>
+    <httpProtocol>
+      <customHeaders>
+        <add name="X-Frame-Options" value="SAMEORIGIN" />
+      </customHeaders>
+    </httpProtocol>
   </system.webServer>
 </configuration>