Add force-execute input in official workflow

[cbeauchesne]

Motivation

Changes

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

[p-datadog]

We have documentation for forcing system tests written in https://github.com/DataDog/dd-trace-rb/blob/master/docs/ForcingSystemTests.md, I would think it should be transfered/amended as necessary to this PR.

[cbeauchesne]

This documentation is about how the list is stored in dd-trace-rb, but not about the parameter itself, so it must kept in dd-trace-rb.