Don't infer UseMonoRuntime based on the RID (#16909)

It is problematic when the RID is set in the .csproj, or when using RuntimeIdentifier_s_.
We will require workloads to explicitly opt-in to the Mono runtime packs.

Author: akoeplinger

src/BlazorWasmSdk/Targets/Microsoft.NET.Sdk.BlazorWebAssembly.Current.props

@@ -13,6 +13,7 @@ Copyright (c) .NET Foundation. All rights reserved.
   <PropertyGroup>
     <!-- Blazor WASM projects are always browser-wasm -->
     <RuntimeIdentifier>browser-wasm</RuntimeIdentifier>
+    <UseMonoRuntime>true</UseMonoRuntime>
 
     <!-- Avoid having the rid show up in output paths -->
     <AppendRuntimeIdentifierToOutputPath>false</AppendRuntimeIdentifierToOutputPath>

src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.RuntimeIdentifierInference.targets

@@ -115,7 +115,6 @@ Copyright (c) .NET Foundation. All rights reserved.
     <SelfContained Condition="'$(SelfContained)' == '' and '$(RuntimeIdentifier)' != ''">true</SelfContained>
     <SelfContained Condition="'$(SelfContained)' == ''">false</SelfContained>
     <_OnOsx>$(NETCoreSdkRuntimeIdentifier.StartsWith('osx'))</_OnOsx>
-    <_RuntimeIdentifierUsesMonoRuntimeByDefault Condition="$(RuntimeIdentifier.StartsWith('ios')) or $(RuntimeIdentifier.StartsWith('tvos')) or $(RuntimeIdentifier.StartsWith('maccatalyst')) or $(RuntimeIdentifier.StartsWith('android')) or $(RuntimeIdentifier.StartsWith('browser'))">true</_RuntimeIdentifierUsesMonoRuntimeByDefault>
     <_RuntimeIdentifierUsesAppHost Condition="$(RuntimeIdentifier.StartsWith('ios')) or $(RuntimeIdentifier.StartsWith('tvos')) or $(RuntimeIdentifier.StartsWith('maccatalyst')) or $(RuntimeIdentifier.StartsWith('android')) or $(RuntimeIdentifier.StartsWith('browser'))">false</_RuntimeIdentifierUsesAppHost>
     <_RuntimeIdentifierUsesAppHost Condition="'$(_RuntimeIdentifierUsesAppHost)' == ''">true</_RuntimeIdentifierUsesAppHost>
     <UseAppHost Condition="'$(UseAppHost)' == '' and
@@ -124,7 +123,6 @@ Copyright (c) .NET Foundation. All rights reserved.
                             ('$(RuntimeIdentifier)' != '' and '$(_TargetFrameworkVersionWithoutV)' >= '2.1') or
                             ('$(_TargetFrameworkVersionWithoutV)' >= '3.0' and $(_OnOsx) != 'true'))">true</UseAppHost>
     <UseAppHost Condition="'$(UseAppHost)' == ''">false</UseAppHost>
-    <UseMonoRuntime Condition="'$(UseMonoRuntime)' == '' and '$(_RuntimeIdentifierUsesMonoRuntimeByDefault)' == 'true'">true</UseMonoRuntime>
   </PropertyGroup>
 
   <!-- Only use the default apphost if building without a RID and without a deps file path (used by GenerateDeps.proj for CLI tools). -->