[release/7.0.1xx] .NET Source-Build 7.0.100-rc.2 October 2022 Updates (#14728)

* Update source-build to 7.0 RC2

* Also update tarball global.json

* Don't touch root global.json in case it is managed by automation

eng/Versions.props

@@ -193,7 +193,7 @@
       or minor release, prebuilts may be needed. When the release is mature, prebuilts are not
       necessary, and this property is removed from the file.
     -->
-    <PrivateSourceBuiltArtifactsPackageVersion>7.0.100-rc.1</PrivateSourceBuiltArtifactsPackageVersion>
+    <PrivateSourceBuiltArtifactsPackageVersion>7.0.100-rc.2</PrivateSourceBuiltArtifactsPackageVersion>
   </PropertyGroup>
   <!-- Workload manifest package versions -->
   <PropertyGroup>

src/SourceBuild/tarball/content/global.json

@@ -1,6 +1,6 @@
 {
   "tools": {
-    "dotnet": "7.0.100-rc.1.22431.12"
+    "dotnet": "7.0.100-rc.2.22477.23"
   },
   "msbuild-sdks": {
     "Microsoft.Build.CentralPackageVersions": "2.0.1",