Update branding to 7.0.0-rc1 (#42682)

Author: dougbu

.github/fabricbot.json

@@ -2562,7 +2562,7 @@
           {
             "name": "addMilestone",
             "parameters": {
-              "milestoneName": "7.0-preview7"
+              "milestoneName": "7.0-rc1"
             }
           }
         ],

eng/Versions.props

@@ -9,15 +9,15 @@
     <AspNetCoreMajorVersion>7</AspNetCoreMajorVersion>
     <AspNetCoreMinorVersion>0</AspNetCoreMinorVersion>
     <AspNetCorePatchVersion>0</AspNetCorePatchVersion>
-    <PreReleaseVersionIteration>7</PreReleaseVersionIteration>
+    <PreReleaseVersionIteration>1</PreReleaseVersionIteration>
     <ValidateBaseline>true</ValidateBaseline>
     <!--
         When StabilizePackageVersion is set to 'true', this branch will produce stable outputs for 'Shipping' packages
     -->
     <StabilizePackageVersion Condition="'$(StabilizePackageVersion)' == ''">false</StabilizePackageVersion>
     <DotNetFinalVersionKind Condition="'$(StabilizePackageVersion)' == 'true'">release</DotNetFinalVersionKind>
-    <PreReleaseVersionLabel>preview</PreReleaseVersionLabel>
-    <PreReleaseBrandingLabel>Preview $(PreReleaseVersionIteration)</PreReleaseBrandingLabel>
+    <PreReleaseVersionLabel>rc</PreReleaseVersionLabel>
+    <PreReleaseBrandingLabel>Release Candidate $(PreReleaseVersionIteration)</PreReleaseBrandingLabel>
     <IncludePreReleaseLabelInPackageVersion>true</IncludePreReleaseLabelInPackageVersion>
     <IncludePreReleaseLabelInPackageVersion Condition=" '$(DotNetFinalVersionKind)' == 'release' ">false</IncludePreReleaseLabelInPackageVersion>
     <AspNetCoreMajorMinorVersion>$(AspNetCoreMajorVersion).$(AspNetCoreMinorVersion)</AspNetCoreMajorMinorVersion>