Fix property name for enabling aspire in MSTest.Sdk (#2888)

Author: Evangelink

src/Package/MSTest.Sdk/Sdk/Runner/NativeAOT.targets

@@ -8,7 +8,7 @@
   </Target>
 
   <Target Name="_MSTestSDKValidateAspire" BeforeTargets="Build">
-    <Error Condition=" '$(EnableAspire)' == 'true' " Text="Aspire MSTest currently doesn't support NativeAOT mode." />
+    <Error Condition=" '$(EnableAspireTesting)' == 'true' " Text="Aspire MSTest currently doesn't support NativeAOT mode." />
   </Target>
 
   <!-- Core -->

src/Package/MSTest.Sdk/Sdk/Sdk.props.template

@@ -5,7 +5,7 @@
   <Import Project="Sdk.props" Sdk="Microsoft.NET.Sdk" />
 
   <PropertyGroup>
-    <EnableAspire Condition=" '$(EnableAspire)' == '' ">false</EnableAspire>
+    <EnableAspireTesting Condition=" '$(EnableAspireTesting)' == '' ">false</EnableAspireTesting>
     <EnablePlaywright Condition=" '$(EnablePlaywright)' == '' ">false</EnablePlaywright>
     <UseVSTest Condition=" '$(UseVSTest)' == '' " >false</UseVSTest>