[build] remove usage of "Facades" directories (#10342)

Context: #10339

In order to complete #10339, I want to refactor & remove the need for
having to define `$(_XATargetFrameworkDirectories)` at all.

An easy first step is to remove the usage of "Facades" directories
because these don't exist in the .NET 6+ world. These are a Mono/.NET
framework-ism, which is replaced by "ref" packs in .NET 6+.

I also removed the `gen-ProfileAssemblies.sh` script, which was used to
generate files specific to Mono & Xamarin.Android, but is no longer
needed.

Author: jonathanpeppers

build-tools/installers/create-installers.targets

@@ -80,8 +80,6 @@
   <ItemGroup>
     <_FrameworkFiles Include="$(FrameworkSrcDir)\$(FirstInstallerFrameworkVersion)\Mono.Android.Export.dll" />
     <_FrameworkFiles Include="$(FrameworkSrcDir)\$(FirstInstallerFrameworkVersion)\Mono.Android.Export.pdb" />
-    <_FrameworkFiles Include="@(MonoFacadeAssembly->'$(FrameworkSrcDir)\$(BclFrameworkVersion)\Facades\%(Identity)')" />
-    <_FrameworkFiles Include="@(MonoFacadeAssemblySymbol->'$(FrameworkSrcDir)\$(BclFrameworkVersion)\Facades\%(Identity)')" />
     <_FrameworkFiles Include="@(MonoProfileAssembly->'$(FrameworkSrcDir)\$(BclFrameworkVersion)\%(Identity)')" />
     <_FrameworkFiles Include="@(MonoProfileAssemblySymbol->'$(FrameworkSrcDir)\$(BclFrameworkVersion)\%(Identity)')" />
     <_FrameworkFiles Include="$(FrameworkSrcDir)\$(BclFrameworkVersion)\Java.Interop.dll" />

build-tools/scripts/gen-ProfileAssemblies.sh

@@ -167,7 +167,7 @@ Copyright (C) 2016 Xamarin. All rights reserved.
       CaseMapFile="$(_GenerateResourceCaseMapFile)"
       DesignTimeBuild="$(DesignTimeBuild)"
       Deterministic="$(Deterministic)"
-      FrameworkDirectories="$(_XATargetFrameworkDirectories);$(_XATargetFrameworkDirectories)Facades"
+      FrameworkDirectories="$(_XATargetFrameworkDirectories)"
       IsApplication="$(AndroidApplication)"
       OutputFile="$(_GenerateResourceDesignerAssemblyOutput)"
       ProjectDir="$(ProjectDir)"

src/Xamarin.Android.Build.Tasks/MSBuild/Xamarin/Android/Xamarin.Android.Resource.Designer.targets

@@ -1313,7 +1313,7 @@ because xbuild doesn't support framework reference assemblies.
 			Resources="@(AndroidResource);@(AndroidBoundLayout)"
 			ResourceDirectory="$(MonoAndroidResourcePrefix)"
 			CaseMapFile="$(_GenerateResourceCaseMapFile)"
-			FrameworkDirectories="$(_XATargetFrameworkDirectories);$(_XATargetFrameworkDirectories)Facades"
+			FrameworkDirectories="$(_XATargetFrameworkDirectories)"
 			AdditionalResourceDirectories="@(LibraryResourceDirectories)"
 			AssemblyName="$(AssemblyName)"
 	>
@@ -1587,7 +1587,7 @@ because xbuild doesn't support framework reference assemblies.
       OutputDirectory="$(IntermediateOutputPath)android"
       PackageNamingPolicy="$(AndroidPackageNamingPolicy)"
       ApplicationJavaClass="$(AndroidApplicationJavaClass)"
-      FrameworkDirectories="$(_XATargetFrameworkDirectories);$(_XATargetFrameworkDirectories)Facades"
+      FrameworkDirectories="$(_XATargetFrameworkDirectories)"
       SupportedAbis="@(_BuildTargetAbis)"
       EnableMarshalMethods="$(_AndroidUseMarshalMethods)"
       IntermediateOutputDirectory="$(IntermediateOutputPath)"