Fix mono aot build (#3122)

* Fix mono aot build

Issue: dotnet/BenchmarkDotNet#2311

- Use the extension props file to set `SelfContained=true` for the
  autogenerated project. This allows the project to have all the
  dependencies in the output folder, as required for AOT.

- Latest BDN copies the `PackageReferences` from
  `MicroBenchmarks.csproj` to the generated project.
  - but it does not copy the version property, thus breaking the build.
  - Move the version property to a Common.props, so it can be used by
    the main MicroBenchmarks.csproj, and the autogenerated project.

* MicroBenchmarks.Mono.props - remove SelfContained=true as it has been moved to the template project in BDN

Author: radical

src/benchmarks/micro/MicroBenchmarks.Common.props

@@ -0,0 +1,28 @@
+<Project>
+  <!-- Shared with the autogenerated project -->
+
+  <!-- out-of-band packages that are not included in NetCoreApp have TFM-specific versions -->
+  <Choose>
+    <When Condition="'$(TargetFramework)' == 'net6.0'">
+        <PropertyGroup>
+            <LangVersion>10.0</LangVersion>
+            <ExtensionsVersion>6.0.0</ExtensionsVersion>
+            <SystemVersion>6.0.0</SystemVersion>
+        </PropertyGroup>
+    </When>
+    <When Condition="'$(TargetFramework)' == 'net7.0'">
+        <PropertyGroup>
+            <LangVersion>11.0</LangVersion>
+            <ExtensionsVersion>7.0.0</ExtensionsVersion>
+            <SystemVersion>7.0.0</SystemVersion>
+        </PropertyGroup>
+    </When>
+    <Otherwise>
+        <!-- when comparing against Full .NET Framework we are usually interested in CLR differences, so net462 belongs to this block -->
+        <PropertyGroup>
+            <ExtensionsVersion>7.0.0</ExtensionsVersion>
+            <SystemVersion>7.0.0</SystemVersion>
+        </PropertyGroup>
+    </Otherwise>
+  </Choose>
+</Project>

src/benchmarks/micro/MicroBenchmarks.Mono.props

@@ -0,0 +1,4 @@
+<Project>
+  <!-- Shared with the autogenerated project -->
+  <Import Project="*Common.props" />
+</Project>

src/benchmarks/micro/MicroBenchmarks.csproj

@@ -20,30 +20,9 @@
     <!-- Allow building with one major version, and running using a sdk with a higher major version -->
     <RollForward Condition="'$(BuildingForWasm)' == 'true'">LatestMajor</RollForward>
   </PropertyGroup>
-  <!-- out-of-band packages that are not included in NetCoreApp have TFM-specific versions -->
-  <Choose>
-    <When Condition="'$(TargetFramework)' == 'net6.0'">
-        <PropertyGroup>
-            <LangVersion>10.0</LangVersion>
-            <ExtensionsVersion>6.0.0</ExtensionsVersion>
-            <SystemVersion>6.0.0</SystemVersion>
-        </PropertyGroup>
-    </When>
-    <When Condition="'$(TargetFramework)' == 'net7.0'">
-        <PropertyGroup>
-            <LangVersion>11.0</LangVersion>
-            <ExtensionsVersion>7.0.0</ExtensionsVersion>
-            <SystemVersion>7.0.0</SystemVersion>
-        </PropertyGroup>
-    </When>
-    <Otherwise>
-        <!-- when comparing against Full .NET Framework we are usually interested in CLR differences, so net462 belongs to this block -->
-        <PropertyGroup>
-            <ExtensionsVersion>7.0.0</ExtensionsVersion>
-            <SystemVersion>7.0.0</SystemVersion>
-        </PropertyGroup>
-    </Otherwise>
-  </Choose>
+
+  <Import Project="$(MSBuildThisFileDirectory)MicroBenchmarks.Common.props" />
+
   <ItemGroup>
     <PackageReference Include="Jil" Version="3.0.0-alpha2" />
     <PackageReference Include="MessagePack" Version="1.9.11" />