Add support for job delete operation

[v-elegacheva]

add job delete operation support

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[Copilot]

Pull request overview

Adds first-class support for deleting Azure Quantum jobs through the Workspace API, and wires that operation into the Cirq integration so cirq.Job.delete() uses the delete operation instead of cancel.

Changes:

• Add Workspace.delete_job() that calls the underlying jobs client delete operation.
• Update azure.quantum.cirq.Job.delete() to invoke workspace.delete_job(...).
• Add a unit test intended to validate the new delete behavior.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
azure-quantum/azure/quantum/workspace.py	Introduces delete_job() API on Workspace calling the jobs delete operation.
azure-quantum/azure/quantum/cirq/job.py	Switches Cirq job deletion to use Workspace.delete_job() instead of cancellation.
azure-quantum/tests/test_workspace.py	Adds a new test case covering job delete behavior.

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[rigidit]

so when we delete the job the status should be "Cancelled"? what's the difference with cancel operation then?

[v-elegacheva]

That is a good question... From my understanding, the "Cancelled" status is coming from the current WorkspaceMock implementation instead of actual service behavior.
During the E2E validation, a deleted job was no longer retrievable after delete_job() succeeded. It did not transition to a "deleted" status, it just disappeared from the service.
I could update the mock to use a "Deleted" status instead, but I am not sure if "Deleted" would be a valid job status in the real service. My understanding is that once a job is deleted, it is removed rather than entering a new status. How would you prefer I proceed?

[rigidit]

see comment above from Copilot: "Consider updating the mock delete implementation to remove the job from the store and changing this test to assert ws.get_job(job_id) raises (e.g., KeyError in the mock, ResourceNotFoundError in real client), so the test actually covers delete semantics."

[rigidit]

I think _client directory contains autogenerated client based on one of the latest api versions >= 2025-12-01-preview supported by our typespecs, so we can probably just remove comment that it was cancellation request before that version.

[v-elegacheva]

Sounds good! I will remove comment