Use qBraid's native OriginQ provider instead of custom metriq-gym one

[vprusso]

• Point qbraid dependency at vprusso/qBraid@add-originq-provider which includes a native OriginQ provider (see [FEATURE] Support OriginQ as provider qBraid/qBraid#1146)
• Remove origin entry points from metriq-gym pyproject.toml
• Update qplatform/device.py to import OriginDevice from qbraid.runtime.origin
• Inline get_origin_connectivity logic (uses device.backend.chip_info() directly)
• Update test constructors to match qBraid's OriginDevice API

Tested end-to-end: dispatched and polled WIT benchmark on WK_C180 (180-qubit hardware).

Dispatch:

uv run mgym job dispatch metriq_gym/schemas/examples/wit.example.json -p origin -d WK_C180

Poll:

Polling job...
[Cached result data]
{'app_version': '0.7.1.dev6+ge2b134ab4.d20260326',
 'job_type': 'WIT',
 'platform': {'device': 'WK_C180',
              'device_metadata': {'num_qubits': 180, 'simulator': False},
              'provider': 'origin'},
 'results': {'expectation_value': {'uncertainty': 0.005050862119521717,
                                   'value': 0.2974853515625},
             'score': {'uncertainty': 0.005050862119521717,
                       'value': 0.2974853515625}},
 'suite_id': None,
 'timestamp': '2026-03-26T14:17:16.832147'}

Results:
  expectation_value: 0.2974853515625 ± 0.005050862119521717
  score: 0.2974853515625 ± 0.005050862119521717

[github-actions]

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