[Pools] Add heterogeneity support.

[lloyd-brown]

Tested (run the relevant ones):

• [ ] Code formatting: install pre-commit (auto-check on commit) or bash format.sh
• [ ] Any manual or new tests for this PR (please specify below)
• [ ] All smoke tests: /smoke-test (CI) or pytest tests/test_smoke.py (local)
• [ ] Relevant individual tests: /smoke-test -k test_name (CI) or pytest tests/test_smoke.py::test_name (local)
• [ ] Backward compatibility: /quicktest-core (CI) or pytest tests/smoke_tests/test_backward_compat.py (local)

[gemini-code-assist[bot]]

Summary of Changes

Hello @lloyd-brown, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the 'Pools' feature by introducing full support for heterogeneous resource configurations. This allows users to define jobs with flexible resource requirements (e.g., 'any_of' T4 or A100 GPUs), and the system will intelligently select and record the specific resource used from the available pool workers. The changes involve core logic updates for resource handling, database integration for tracking resolved resources, and the removal of prior limitations on heterogeneous pools, all validated by new, dedicated smoke tests.

Highlights

• Heterogeneous Resource Support: The system now correctly handles tasks with 'any_of' or 'ordered' resource configurations, allowing for more flexible resource allocation in pools.
• Dynamic Resource Resolution: When a job with heterogeneous resource requirements is scheduled, the specific resource chosen from the 'any_of'/'ordered' list is now recorded in the job's 'full_resources' in the database.
• Removed Heterogeneity Restrictions: Previous validation that prevented the creation of pools with heterogeneous accelerators has been removed, enabling this feature.
• Enhanced Resource-Aware Scheduling: The scheduling logic has been updated to account for heterogeneous resources, including a fallback mechanism for unresolved configurations and specific updates when a resource is selected.
• New Smoke Tests: Comprehensive smoke tests have been added to validate the new heterogeneous pool functionality, including scenarios for 'any_of' accelerators and resource-aware scheduling.

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[lloyd-brown]

/smoke-test -k test_pools_heterogeneous

[lloyd-brown]

/smoke-test -k test_pools_heterogeneous

[lloyd-brown]

/smoke-test -k test_pools