Update Serverless teams in CODEOWNERS (#6918)

## Summary of changes

Update `CODEOWNERS` for serverless-related files.

## Reason for change

Recent team changes.

## Implementation details

- add team `apm-serverless` to all serverless files
- use team `serverless-azure-gcp` instead of `serverless-aws` for
Azure-related files
- added serverless-related files that were missing

## Test coverage

n/a

## Other details
n/a
<!-- Fixes #{issue} -->

<!-- ⚠️ Note: where possible, please obtain 2 approvals prior to
merging. Unless CODEOWNERS specifies otherwise, for external teams it is
typically best to have one review from a team member, and one review
from apm-dotnet. Trivial changes do not require 2 reviews. -->

Author: lucaspimentel

.github/CODEOWNERS

@@ -132,15 +132,26 @@ Datadog.Trace.Debugger.slnf                @DataDog/debugger-dotnet
 # Exploration tests
 /tracer/build/_build/Build.ExplorationTests.cs @DataDog/debugger-dotnet @DataDog/tracing-dotnet @DataDog/profiling-dotnet
 
-# Serverless
-/tracer/src/Datadog.Trace/ClrProfiler/AutoInstrumentation/AWS/Lambda/    @DataDog/tracing-dotnet  @DataDog/serverless-aws
-/tracer/src/Datadog.Trace/ClrProfiler/AutoInstrumentation/AWS/SDK/    @DataDog/tracing-dotnet  @DataDog/serverless-aws
-/tracer/src/Datadog.Trace/ClrProfiler/ServerlessInstrumentation/   @DataDog/tracing-dotnet  @DataDog/serverless-aws
-/tracer/test/Datadog.Trace.ClrProfiler.IntegrationTests/AWS/       @DataDog/tracing-dotnet  @DataDog/serverless-aws
-/tracer/test/test-applications/azure-functions/                    @DataDog/tracing-dotnet  @DataDog/serverless-aws
-/tracer/test/test-applications/integrations/Samples.AWS.Lambda/    @DataDog/tracing-dotnet  @DataDog/serverless-aws
-/tracer/test/test-applications/integrations/Samples.Amazon.Lambda.RuntimeSupport/        @DataDog/tracing-dotnet  @DataDog/serverless-aws
-docker-compose.serverless.yml                                      @DataDog/tracing-dotnet  @DataDog/serverless-aws
+# Serverless (General)
+/tracer/src/Datadog.Trace/ClrProfiler/ServerlessInstrumentation/                         @DataDog/tracing-dotnet @DataDog/apm-serverless
+
+# Serverless (AWS)
+/tracer/src/Datadog.Trace/ClrProfiler/AutoInstrumentation/AWS/                           @DataDog/tracing-dotnet @DataDog/apm-serverless @DataDog/serverless-aws
+/tracer/src/Datadog.Trace/ClrProfiler/ServerlessInstrumentation/LambdaMetadata.cs        @DataDog/tracing-dotnet @DataDog/apm-serverless @DataDog/serverless-aws
+/tracer/test/Datadog.Trace.Tests/Configuration/TracerSettingsServerlessTests.cs          @DataDog/tracing-dotnet @DataDog/apm-serverless @DataDog/serverless-aws
+/tracer/test/Datadog.Trace.ClrProfiler.IntegrationTests/AWS/                             @DataDog/tracing-dotnet @DataDog/apm-serverless @DataDog/serverless-aws
+/tracer/test/test-applications/integrations/Samples.AWS.*/                               @DataDog/tracing-dotnet @DataDog/apm-serverless @DataDog/serverless-aws
+/tracer/test/test-applications/integrations/Samples.Amazon.Lambda.RuntimeSupport/        @DataDog/tracing-dotnet @DataDog/apm-serverless @DataDog/serverless-aws
+docker-compose.serverless.yml                                                            @DataDog/tracing-dotnet @DataDog/apm-serverless @DataDog/serverless-aws
+/tracer/build/_build/docker/serverless.lambda.dockerfile                                 @DataDog/tracing-dotnet @DataDog/apm-serverless @DataDog/serverless-aws
+/.gitlab/download-serverless-artifacts.sh                                                @DataDog/tracing-dotnet @DataDog/apm-serverless @DataDog/serverless-aws
+/docs/development/Serverless.md                                                          @DataDog/tracing-dotnet @DataDog/apm-serverless @DataDog/serverless-aws
+
+# Serverless (Azure/GCP)
+/tracer/src/Datadog.Trace/ClrProfiler/AutoInstrumentation/Azure/                         @DataDog/tracing-dotnet @DataDog/apm-serverless @DataDog/serverless-azure-gcp
+/tracer/src/Datadog.Trace/ClrProfiler/ServerlessInstrumentation/ServerlessMiniAgent.cs   @DataDog/tracing-dotnet @DataDog/apm-serverless @DataDog/serverless-azure-gcp
+/tracer/test/Datadog.Trace.Tests/ServerlessMiniAgentTests.cs                             @DataDog/tracing-dotnet @DataDog/apm-serverless @DataDog/serverless-azure-gcp
+/tracer/test/test-applications/azure-functions/                                          @DataDog/tracing-dotnet @DataDog/apm-serverless @DataDog/serverless-azure-gcp
 
 # Shared code we could move to the root folder
 /tracer/build/                            @DataDog/apm-dotnet