build: recreate broken local venv before runner setup

[AlexeyKuznetsov-DD]

Motivation

Improve DevEx if Python updated via brew or manually.

My build failed with error like:

Build runner
dyld[21311]: Library not loaded: /opt/homebrew/Cellar/python@3.12/3.12.12_2/Frameworks/Python.framework/Versions/3.12/Python
  Referenced from: .../system-tests/venv/bin/python
  Reason: tried: '/opt/homebrew/.../Versions/3.12/Python' (no such file),
  '/System/Volumes/.../Python.framework/Versions/3.12/Python' (no such file),
  '/opt/homebrew/.../Versions/3.12/Python' (no such file)
 ./utils/build/build.sh: line 141: 21311 Abort trap: 6
 python -m pip install --upgrade pip setuptools==75.8.0
❌ Attempt 1 failed with exit code 134

Changes

Updated utils/build/build.sh to make runner environment setup resilient to stale virtualenvs.
Before using an existing venv, the script now runs a lightweight health check (venv/bin/python -V).
If that check fails, it removes and recreates venv automatically, preventing build failures caused by invalid Python paths after local Python/Homebrew upgrades.

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

• Anything but tests/ or manifests/ is modified ? 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, removed or renamed?
  • Get a review from R&P team

[github-actions]

CODEOWNERS have been resolved as:

utils/build/build.sh                                                    @DataDog/system-tests-core

[datadog-prod-us1-3]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

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