Filter our exit span from Azure Functions tests (#7391)

## Summary of changes

Filter out the "exit" span from Azure Functions tests

## Reason for change

The presence of the span is flaky, so filter it out to resolve issues.

## Implementation details

Our current approach to killing the azure functions sample is a bit
hacky, and can sometimes result in us creating a span. This can be
reproduced locally in particular. To avoid issues and flakiness around
it, just filter out the span.

## Test coverage

Covered by existing

## Other details

Discovered as part of
#7170

---------

Co-authored-by: Steven Bouwkamp <[email protected]>

Author: andrewlock

tracer/test/Datadog.Trace.ClrProfiler.IntegrationTests/AzureFunctionsTests.cs

@@ -149,11 +149,12 @@ public async Task SubmitsTraces()
             {
                 const int expectedSpanCount = 21;
                 var spans = await agent.WaitForSpansAsync(expectedSpanCount);
+                var filteredSpans = spans.Where(s => !s.Resource.Equals("Timer ExitApp", StringComparison.OrdinalIgnoreCase)).ToImmutableList();
 
                 using var s = new AssertionScope();
-                spans.Count.Should().Be(expectedSpanCount);
+                filteredSpans.Count.Should().Be(expectedSpanCount);
 
-                await AssertInProcessSpans(spans);
+                await AssertInProcessSpans(filteredSpans);
             }
         }
     }
@@ -216,10 +217,10 @@ public async Task SubmitsTraces()
             {
                 const int expectedSpanCount = 21;
                 var spans = await agent.WaitForSpansAsync(expectedSpanCount);
-
+                var filteredSpans = spans.Where(s => !s.Resource.Equals("Timer ExitApp", StringComparison.OrdinalIgnoreCase)).ToImmutableList();
                 using var s = new AssertionScope();
 
-                await AssertIsolatedSpans(spans, $"{nameof(AzureFunctionsTests)}.Isolated.V4.Sdk1");
+                await AssertIsolatedSpans(filteredSpans, $"{nameof(AzureFunctionsTests)}.Isolated.V4.Sdk1");
             }
         }
     }
@@ -282,12 +283,13 @@ public async Task SubmitsTraces()
             {
                 const int expectedSpanCount = 21;
                 var spans = await agent.WaitForSpansAsync(expectedSpanCount);
+                var filteredSpans = spans.Where(s => !s.Resource.Equals("Timer ExitApp", StringComparison.OrdinalIgnoreCase)).ToImmutableList();
 
                 using var s = new AssertionScope();
 
-                await AssertIsolatedSpans(spans);
+                await AssertIsolatedSpans(filteredSpans);
 
-                spans.Count.Should().Be(expectedSpanCount);
+                filteredSpans.Count.Should().Be(expectedSpanCount);
             }
         }
     }

tracer/test/test-applications/azure-functions/Samples.AzureFunctions.V4Isolated.AspNetCore/Samples.AzureFunctions.V4Isolated.AspNetCore.csproj

@@ -11,8 +11,9 @@
     <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Http" Version="3.2.0" />
     <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore" Version="2.0.0" />
     <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Timer" Version="4.3.1" />
-    <PackageReference Include="Microsoft.Azure.Functions.Worker.Sdk" Version="2.0.0" />
+    <PackageReference Include="Microsoft.Azure.Functions.Worker.Sdk" Version="2.0.4" />
   </ItemGroup>
+  
   <!-- Just reducing duplication, we can evolve these separate if we need to later (Program.cs is different here)-->
   <ItemGroup>
     <Compile Include="..\Samples.AzureFunctions.V4Isolated\AllTriggers.cs" Link="%(RecursiveDir)%(Filename)%(Extension)" />