[python]: enable forwarder tests v2

[betterengineering]

Motivation

Python has been failing the forwarder tests for some time. The injection metadata tests added by @sydney-tung also rely on this feature to be working. I've fixed the Python tracer integration with telemetry forwarding here: DataDog/dd-trace-py#13926. This change enables both tests so they can be run on the Python pipeline.

Changes

This change enables the two broken forwarder tests for python that have been fixed, which unblocks the addition of the injection metadata test.

Workflow

1. ⚠️ Create your PR as draft ⚠️
2. Work on you PR until the CI passes
3. Mark it as ready for review
   • Test logic is modified? -> Get a review from RFC owner.
   • Framework is modified, or non obvious usage of it -> get a review from R&P team

🚀 Once your PR is reviewed and the CI green, you can merge it!

🛟 #apm-shared-testing 🛟

Reviewer checklist

• If PR title starts with [<language>], double-check that only <language> is impacted by the change
• No system-tests internal is modified. Otherwise, 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 (or removed)?
  • Get a review from R&P team

[brettlangdon]

this lgtm, and Mark and I ran these on a video call with an image with the change from dd-trace-py and both tests are passing, we also tested with the 3.10.2 artifact to confirm it is skipped, and they are skipped for older versions of Python we do not support.

[robertomonteromiguel]

I forced to test with the latest python tracer, and the tests are failing:

weblog_url: 
agent: 1:7.68.0-1
datadog-apm-inject: 0.39.1-dev.b0d6e40.glci945052743.ga97db900
datadog-apm-library: 3.11.0.dev82+g378df652a
docker: 
datadog-installer: 7.63.0-installer-0.12.14-rc.3
Configuration
app_type: docker_ssi
os: Ubuntu_22_amd64
arch: amd64
runtime_version: 3.8.20
Pulling ghcr.io/datadog/dd-apm-test-agent/ddapm-test-agent:v1.20.0

https://gitlab.ddbuild.io/DataDog/system-tests/-/pipelines/70267782

Let me know if you need help to solve this

[brettlangdon]

@robertomonteromiguel this change depends on DataDog/dd-trace-py#13926 being merged first with the fix. So the fact that this currently fails on latest is known "blocker" 👍🏻

We haven't found a good way to merge this change first, so we can ensure it runs on the PR in dd-trace-py before merging the dd-trace-py PR. So we were going to merge the dd-trace-py PR first, and then this one (not ideal, but... do we have other options?)

[robertomonteromiguel]

DataDog/dd-trace-py#13926

@brettlangdon you could add the variable "SYSTEM_TESTS_REF" in the gitlab file of your python PR (configure_system_tests) and point to the latest commit hash of this system-tests PR.