[CHAOSPLT-1330][FIX] PodReplacement: Ignore container requirement

[aymericDD]

What does this PR do?

• Adds new functionality
• Alters existing functionality
• Fixes a bug
• Improves documentation or testing

Please briefly describe your changes as well as the motivation behind them:

Pod replacement operates at the pod level and should not require container information. The feature was failing because the injector expected target containers to be specified, but pod replacement works directly with pods identified by their IP address.

This fix adds logic to detect when running the pod-replacement command and ignore the containers.

Code Quality Checklist

• The documentation is up to date.
• My code is sufficiently commented and passes continuous integration checks.
• I have signed my commit (see Contributing Docs).

Testing

• I leveraged continuous integration testing
  • by depending on existing unit tests or end-to-end tests.
  • by adding new unit tests or end-to-end tests.
• I manually tested the following steps:
  • x
  • locally.
  • as a canary deployment to a cluster.

[datadog-datadog-prod-us1]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

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