Remove unused platform configurations from solution

Deleted ARM, ARM64, x64, and x86 platform entries from the solution file, leaving only 'Any CPU'. This simplifies configuration and may reflect updated project requirements.

Author: Sergio0694

dotnet Community Toolkit.slnx

@@ -1,10 +1,6 @@
 <Solution>
   <Configurations>
     <Platform Name="Any CPU" />
-    <Platform Name="ARM" />
-    <Platform Name="ARM64" />
-    <Platform Name="x64" />
-    <Platform Name="x86" />
   </Configurations>
   <Folder Name="/Solution Items/">
     <File Path=".editorconfig" />