Update branding to 7.0.0-rc2 (#43240)

.github/fabricbot.json

@@ -2562,7 +2562,7 @@
           {
             "name": "addMilestone",
             "parameters": {
-              "milestoneName": "7.0-rc1"
+              "milestoneName": "7.0-rc2"
             }
           }
         ],

eng/Versions.props

@@ -9,7 +9,7 @@
     <AspNetCoreMajorVersion>7</AspNetCoreMajorVersion>
     <AspNetCoreMinorVersion>0</AspNetCoreMinorVersion>
     <AspNetCorePatchVersion>0</AspNetCorePatchVersion>
-    <PreReleaseVersionIteration>1</PreReleaseVersionIteration>
+    <PreReleaseVersionIteration>2</PreReleaseVersionIteration>
     <ValidateBaseline>true</ValidateBaseline>
     <!--
         When StabilizePackageVersion is set to 'true', this branch will produce stable outputs for 'Shipping' packages