Change IsEscrowMode to true in config.props (#7255)

Author: kartheekp-ms

build/config.props

@@ -22,7 +22,7 @@
     <!-- Preview 3 is typically the last "main branch" preview, so we start using rc at this time -->
     <ReleaseLabel Condition=" '$(ReleaseLabel)' == '' ">rc</ReleaseLabel>
 
-    <IsEscrowMode Condition="'$(IsEscrowMode)' == ''">false</IsEscrowMode>
+    <IsEscrowMode Condition="'$(IsEscrowMode)' == ''">true</IsEscrowMode>
 
     <!-- Visual Studio Insertion Logic -->
     <VsTargetBranch Condition="'$(VsTargetBranch)' == '' And '$(IsEscrowMode)' != 'true'">main</VsTargetBranch>