[repo] move PooledList to Zipkin (open-telemetry#6092)

Author: SimonCropp

src/Shared/PooledList.cs renamed to src/OpenTelemetry.Exporter.Zipkin/Implementation/PooledList.cs

@@ -11,7 +11,6 @@
   <ItemGroup>
     <Compile Include="$(RepoRoot)\src\Shared\Configuration\*.cs" Link="Includes\Configuration\%(Filename).cs" />
     <Compile Include="$(RepoRoot)\src\Shared\Guard.cs" Link="Includes\Guard.cs" />
-    <Compile Include="$(RepoRoot)\src\Shared\PooledList.cs" Link="Includes\PooledList.cs" />
     <Compile Include="$(RepoRoot)\src\Shared\ResourceSemanticConventions.cs" Link="Includes\ResourceSemanticConventions.cs" />
     <Compile Include="$(RepoRoot)\src\Shared\ActivityHelperExtensions.cs" Link="Includes\ActivityHelperExtensions.cs" />
     <Compile Include="$(RepoRoot)\src\Shared\EnvironmentVariables\*.cs" Link="Includes\EnvironmentVariables\%(Filename).cs" />

src/OpenTelemetry.Exporter.Zipkin/OpenTelemetry.Exporter.Zipkin.csproj

@@ -19,7 +19,6 @@
   <ItemGroup>
     <Compile Include="$(RepoRoot)\src\Shared\Metrics\Base2ExponentialBucketHistogramHelper.cs" Link="Includes\Metrics\Base2ExponentialBucketHistogramHelper.cs" />
     <Compile Include="$(RepoRoot)\src\Shared\PeriodicExportingMetricReaderHelper.cs" Link="Includes\PeriodicExportingMetricReaderHelper.cs" />
-    <Compile Include="$(RepoRoot)\src\Shared\PooledList.cs" Link="Includes\PooledList.cs" />
     <Compile Include="$(RepoRoot)\src\Shared\TagWriter\*.cs" Link="Includes\TagWriter\%(Filename).cs" />
   </ItemGroup>