Improved Kubernetes orchestrator pod caching

[schustmi]

Describe changes

This PR

• enables orchestrator pod caching for scheduled runs.
• delays the caching decision to run right before the actual step pod starts, not at orchestrator pod startup. This means the caching decision will be made with the latest state of all step runs available in the server, which might differ from the step runs available at orchestrator pod startup.
• adds metadata to the Kubernetes orchestrator.
• improves pod labels when using the Kubernetes orchestrator.

Changes to what we consider placeholder runs: Previously, a run without an orchestrator_run_id in the database was considered a placeholder run. This PR changes that behaviour and instead uses the status of a run to decide whether the run is a placeholder run (runs with state initializing are placeholder runs). This change was necessary so that the orchestrator pod can create a pipeline run (with orchestrator run ID) for scheduled runs to enable the orchestrator pod caching.

Pre-requisites

Please ensure you have done the following:

• [ ] I have read the CONTRIBUTING.md document.
• [ ] I have added tests to cover my changes.
• [ ] I have based my new branch on develop and the open PR is targeting develop. If your branch wasn't based on develop read Contribution guide on rebasing branch to develop.
• [ ] IMPORTANT: I made sure that my changes are reflected properly in the following resources:
  • [ ] ZenML Docs
  • [ ] Dashboard: Needs to be communicated to the frontend team.
  • [ ] Templates: Might need adjustments (that are not reflected in the template tests) in case of non-breaking changes and deprecations.
  • [ ] Projects: Depending on the version dependencies, different projects might get affected.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Other (add details above)

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Documentation Link Check Results

✅ Absolute links check passed ✅ Relative links check passed _{Last checked: 2025-06-05 07:30:49 UTC}