ci: migrate generate_system_tests_lib_injection_images job to golden path runners

[chagui]

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Motivation

This repo is still using runner:main and runner:docker which are legacy runners that will be decommissioned soon due to running on EOL OS.

Changes

Migrate the jobs to the kubernetes runners since we can do docker builds in K8s via buildkit and the other jobs don't access docker at all.

Relevant docs:

• Migrate off runner docker and runner main
• Building Container Images on Kubernetes
• Runner docker and docker-arm migration

[!NOTE] For any questions, contact us on #ci-runner-docker-deprecation

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

:rocket: 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