Enable docker_ssi/test_instrumentation_source_ssi test for PHP

[iamluc]

Motivation

Test PHP implementation: DataDog/dd-trace-php#3301

Changes

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

🚀 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

[iamluc]

/merge

[dd-devflow-routing-codex]

View all feedbacks in Devflow UI.

2025-08-29 15:16:32 UTC ℹ️ Start processing command /merge

---

2025-08-29 15:16:47 UTC ℹ️ MergeQueue: pull request added to the queue

The expected merge time in main is approximately 3m (p90).

---

2025-08-29 15:39:01 UTC ℹ️ MergeQueue: This merge request was merged