[WIP] Enable Config Consistency tests for Golang

[mtoffl01]

Motivation

Config Consistency effort

Changes

• Enables various tests in golang.yml that are already supported in dd-trace-go (most are marked with 1.67.0 which was the current version at the time of testing; one other is marked with v1.62.0 which is the version that contained a fix specific to the test)
• Enables various tests in golang.yml that will be supported in upcoming dd-trace-go release v1.69.0, thanks to this PR
• Improves system-test execution documentation for Go
• Amends Test_Config_TraceAgentURL test class to support how dd-trace-go formats trace_agent_url in startup log
• Modifies /make_distant_call endpoint to return a response in JSON format
• Updates Go parametric app's GetTraceConfig logic to include trace rate limit and trace agent URL info in HTTP response

Workflow

1. ⚠️ Create your PR as draft ⚠️
2. Work on you PR until the CI passes (if something not related to your task is failing, you can ignore it)
3. Mark it as ready for review
   • Test logic is modified? -> Get a review from RFC owner. We're working on refining the codeowners file quickly.
   • Framework is modified, or non obvious usage of it -> get a review from R&P team

:rocket: Once your PR is reviewed, 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
• [ ] CI is green, or failing jobs are not related to this change (and you are 100% sure about this statement)
• [ ] 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