Remove OpenTelemetry.SemanticConventions project (#5539)

Author: reyang

OpenTelemetry.proj

@@ -3,9 +3,6 @@
     <SolutionProjects Include="**\*.csproj" />
     <PackProjects Include="src\**\*.csproj" />
     <TestProjects Include="test\**\*.csproj" />
-
-    <!-- Not pack SemanticConventions project for now -->
-    <PackProjects Remove="src\OpenTelemetry.SemanticConventions\OpenTelemetry.SemanticConventions.csproj" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(RunningDotNetPack)' == 'true'">

OpenTelemetry.sln

@@ -210,8 +210,6 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenTelemetry.Tests.Stress"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "getting-started-prometheus-grafana", "docs\metrics\getting-started-prometheus-grafana\getting-started-prometheus-grafana.csproj", "{41B784AA-3301-4126-AF9F-1D59BD04B0BF}"
 EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenTelemetry.SemanticConventions", "src\OpenTelemetry.SemanticConventions\OpenTelemetry.SemanticConventions.csproj", "{D4519DF6-CC72-4AC4-A851-E21383098D11}"
-EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "customizing-the-sdk", "docs\logs\customizing-the-sdk\customizing-the-sdk.csproj", "{6C7A1595-36D6-4229-BBB5-5A6B5791791D}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenTelemetry.Extensions.Propagators", "src\OpenTelemetry.Extensions.Propagators\OpenTelemetry.Extensions.Propagators.csproj", "{E91B2E40-E428-43B3-8A43-09709F0E69E4}"

src/OpenTelemetry.SemanticConventions/.publicApi/PublicAPI.Shipped.txt

@@ -27,7 +27,6 @@
     <TrimmerRootAssembly Include="OpenTelemetry.Instrumentation.GrpcNetClient" />
     <TrimmerRootAssembly Include="OpenTelemetry.Instrumentation.Http" />
     <TrimmerRootAssembly Include="OpenTelemetry.Instrumentation.SqlClient" />
-    <TrimmerRootAssembly Include="OpenTelemetry.SemanticConventions" />
     <TrimmerRootAssembly Include="OpenTelemetry.Shims.OpenTracing" />
     <TrimmerRootAssembly Include="OpenTelemetry" />