Remove BUILDING_OTEL define

Author: rajkumar-rangaraj

src/Tools/dotnet-monitor/dotnet-monitor.csproj

@@ -37,10 +37,6 @@
     <ProjectReference Include="$(DIAGNOSTICS_REPO_ROOT)\src\Microsoft.Diagnostics.Monitoring\Microsoft.Diagnostics.Monitoring.csproj" />
   </ItemGroup>
 
-  <PropertyGroup>
-    <DefineConstants>$(DefineConstants);BUILDING_OTEL</DefineConstants>
-  </PropertyGroup>
-
   <ItemGroup>
     <ProjectReference Include="..\..\Microsoft.Diagnostics.Monitoring.Options\Microsoft.Diagnostics.Monitoring.Options.csproj" />
     <ProjectReference Include="..\..\Microsoft.Diagnostics.Monitoring.WebApi\Microsoft.Diagnostics.Monitoring.WebApi.csproj" />