[CI Visibility] Specify if the user is setting the DD_SERVICE (#6348)

## Summary of changes

This PR sets a tag to let the ci visibility backend know if the
DD_SERVICE value was provided by the user or auto-generated.

## Reason for change

This required by the backend.

## Test coverage

- Updated snapshots.
- Fixed tests

## Other details
<!-- Fixes #{issue} -->

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tracer/src/Datadog.Trace/Ci/CIVisibility.cs

@@ -16,6 +16,7 @@
 using Datadog.Trace.Agent.Transports;
 using Datadog.Trace.Ci.CiEnvironment;
 using Datadog.Trace.Ci.Configuration;
+using Datadog.Trace.Ci.Tags;
 using Datadog.Trace.Configuration;
 using Datadog.Trace.HttpOverStreams;
 using Datadog.Trace.Logging;
@@ -134,6 +135,11 @@ public static void Initialize()
             {
                 // Extract repository name from the git url and use it as a default service name.
                 tracerSettings.ServiceNameInternal = GetServiceNameFromRepository(CIEnvironmentValues.Instance.Repository);
+                tracerSettings.GlobalTagsInternal[CommonTags.UserProvidedTestServiceTag] = "false";
+            }
+            else
+            {
+                tracerSettings.GlobalTagsInternal[CommonTags.UserProvidedTestServiceTag] = "true";
             }
 
             // Normalize the service name
@@ -203,6 +209,11 @@ internal static void InitializeFromRunner(CIVisibilitySettings settings, IDiscov
             {
                 // Extract repository name from the git url and use it as a default service name.
                 tracerSettings.ServiceNameInternal = GetServiceNameFromRepository(CIEnvironmentValues.Instance.Repository);
+                tracerSettings.GlobalTagsInternal[CommonTags.UserProvidedTestServiceTag] = "false";
+            }
+            else
+            {
+                tracerSettings.GlobalTagsInternal[CommonTags.UserProvidedTestServiceTag] = "true";
             }
 
             // Normalize the service name

tracer/src/Datadog.Trace/Ci/Tags/CommonTags.cs

@@ -204,4 +204,9 @@ internal static class CommonTags
     /// GIT PR Base branch name
     /// </summary>
     public const string GitPrBaseBranch = "git.pull_request.base_branch";
+
+    /// <summary>
+    /// Defines if the service is a user provided test service
+    /// </summary>
+    public const string UserProvidedTestServiceTag = "_dd.test.is_user_provided_service";
 }

tracer/test/Datadog.Trace.ClrProfiler.IntegrationTests/CI/MsTestV2EvpTests.cs

@@ -198,6 +198,9 @@ await Verifier.Verify(
                             targetTest.Meta.Remove(EarlyFlakeDetectionTags.TestIsNew);
                             targetTest.Meta.Remove(EarlyFlakeDetectionTags.TestIsRetry);
 
+                            // Remove user provided service tag
+                            targetTest.Meta.Remove(CommonTags.UserProvidedTestServiceTag);
+
                             // check the name
                             Assert.Equal("mstestv2.test", targetTest.Name);
 

tracer/test/Datadog.Trace.ClrProfiler.IntegrationTests/CI/MsTestV2Tests.cs

@@ -104,6 +104,9 @@ public async Task SubmitTraces(string packageVersion)
                             targetSpan.Tags.Remove(EarlyFlakeDetectionTags.TestIsNew);
                             targetSpan.Tags.Remove(EarlyFlakeDetectionTags.TestIsRetry);
 
+                            // Remove user provided service tag
+                            targetSpan.Tags.Remove(CommonTags.UserProvidedTestServiceTag);
+
                             // check the name
                             Assert.Equal("mstestv2.test", targetSpan.Name);
 

tracer/test/Datadog.Trace.ClrProfiler.IntegrationTests/CI/NUnitEvpTests.cs

@@ -229,6 +229,9 @@ public async Task SubmitTraces(string packageVersion, string evpVersionToRemove,
                             targetTest.Meta.Remove(EarlyFlakeDetectionTags.TestIsNew);
                             targetTest.Meta.Remove(EarlyFlakeDetectionTags.TestIsRetry);
 
+                            // Remove user provided service tag
+                            targetTest.Meta.Remove(CommonTags.UserProvidedTestServiceTag);
+
                             // check the name
                             Assert.Equal("nunit.test", targetTest.Name);
 

tracer/test/Datadog.Trace.ClrProfiler.IntegrationTests/CI/NUnitTests.cs

@@ -98,6 +98,9 @@ public async Task SubmitTraces(string packageVersion)
                             targetSpan.Tags.Remove(EarlyFlakeDetectionTags.TestIsNew);
                             targetSpan.Tags.Remove(EarlyFlakeDetectionTags.TestIsRetry);
 
+                            // Remove user provided service tag
+                            targetSpan.Tags.Remove(CommonTags.UserProvidedTestServiceTag);
+
                             // check the name
                             targetSpan.Name.Should().Be("nunit.test");
 

tracer/test/Datadog.Trace.ClrProfiler.IntegrationTests/CI/XUnitEvpTests.cs

@@ -203,6 +203,9 @@ public virtual async Task SubmitTraces(string packageVersion, string evpVersionT
                 targetTest.Meta.Remove(EarlyFlakeDetectionTags.TestIsNew);
                 targetTest.Meta.Remove(EarlyFlakeDetectionTags.TestIsRetry);
 
+                // Remove user provided service tag
+                targetTest.Meta.Remove(CommonTags.UserProvidedTestServiceTag);
+
                 // check the name
                 Assert.Equal("xunit.test", targetTest.Name);
 

tracer/test/Datadog.Trace.ClrProfiler.IntegrationTests/CI/XUnitTests.cs

@@ -72,6 +72,9 @@ public virtual async Task SubmitTraces(string packageVersion)
                     targetSpan.Tags.Remove(EarlyFlakeDetectionTags.TestIsNew);
                     targetSpan.Tags.Remove(EarlyFlakeDetectionTags.TestIsRetry);
 
+                    // Remove user provided service tag
+                    targetSpan.Tags.Remove(CommonTags.UserProvidedTestServiceTag);
+
                     // check the name
                     Assert.Equal("xunit.test", targetSpan.Name);