Add test for service source field on trace stats

[amarziali]

Motivation

This PR adds system tests to verify that tracers correctly set the service name override source field (srv_src in stats buckets) when a DD integration overrides the service name.

This is currently enforced only in java.

Changes

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   • Test logic is modified? -> Get a review from RFC owner.
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Reviewer checklist

• Anything but tests/ or manifests/ is modified ? I have the approval from R&P team
• A docker base image is modified?
  • the relevant build-XXX-image label is present
• A scenario is added, removed or renamed?
  • Get a review from R&P team

[github-actions]

CODEOWNERS have been resolved as:

manifests/cpp.yml                                                       @DataDog/dd-trace-cpp
manifests/cpp_httpd.yml                                                 @DataDog/dd-trace-cpp
manifests/cpp_nginx.yml                                                 @DataDog/dd-trace-cpp
manifests/dotnet.yml                                                    @DataDog/apm-dotnet @DataDog/asm-dotnet
manifests/golang.yml                                                    @DataDog/dd-trace-go-guild
manifests/java.yml                                                      @DataDog/asm-java @DataDog/apm-java
manifests/java_otel.yml                                                 @DataDog/system-tests-core
manifests/nodejs.yml                                                    @DataDog/dd-trace-js
manifests/nodejs_otel.yml                                               @DataDog/system-tests-core
manifests/php.yml                                                       @DataDog/apm-php @DataDog/asm-php
manifests/python.yml                                                    @DataDog/apm-python @DataDog/asm-python
manifests/python_lambda.yml                                             @DataDog/apm-python @DataDog/asm-python
manifests/python_otel.yml                                               @DataDog/apm-python @DataDog/asm-python
manifests/ruby.yml                                                      @DataDog/ruby-guild @DataDog/asm-ruby
manifests/rust.yml                                                      @DataDog/apm-rust
tests/schemas/utils/agent/api/v0.2/stats-request.json                   @DataDog/system-tests-core
tests/schemas/utils/library/v0.6/stats-request.json                     @DataDog/system-tests-core
tests/stats/test_stats.py                                               @DataDog/system-tests-core

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[datadog-prod-us1-5]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

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[raphaelgavache]

it's implemented now in go and merged in main, but can be done later