Disable cdacreader project in source-build (#100807)

NativeAOT doesn't work in source-build so we need to disable the project there to avoid restore errors.
See dotnet/installer#19333 (comment)

src/native/managed/compile-native.proj

@@ -24,6 +24,7 @@
         <!-- NativeAOT doesn't support cross-OS compilation. disable for crossdac-->
         <SupportsNativeAotComponents Condition="'$(SupportsNativeAotComponents)' == '' and '$(HostOS)' != '$(TargetOS)'">false</SupportsNativeAotComponents>
         <!-- unsupported targets -->
+        <SupportsNativeAotComponents Condition="'$(SupportsNativeAotComponents)' == '' and '$(DotNetBuildSourceOnly)' == 'true'">false</SupportsNativeAotComponents>
         <SupportsNativeAotComponents Condition="'$(SupportsNativeAotComponents)' == '' and ('$(TargetArchitecture)' == 'arm' or '$(TargetArchitecture)' == 'armel' or '$(TargetArchitecture)' == 'x86' or '$(TargetArchitecture)' == 'riscv64')">false</SupportsNativeAotComponents>
         <SupportsNativeAotComponents Condition="'$(SupportsNativeAotComponents)' == '' and ('$(TargetsWindows)' == 'true' or '$(TargetsOSX)' == 'true' or ('$(TargetsLinux)' == 'true' and '$(TargetsAndroid)' != 'true' and '$(TargetsLinuxMusl)' != 'true'))">true</SupportsNativeAotComponents>
         <SupportsNativeAotComponents Condition="'$(SupportsNativeAotComponents)' == ''">false</SupportsNativeAotComponents>