Rename IBM Direct Access API

[ohtanim]

Description of Change

The IBM Direct Access API has been renamed to the IBM Quantum System API.
This PR addresses this API name change only and does not include any functional changes.

Important

The IBM Direct Access API has been renamed to the IBM Quantum System API.
As part of this change, the previously available resource type name has been updated from direct-access to ibm-quantum-system.
During a transition period, both direct-access and ibm-quantum-system resource type names will be supported.
After the transition period ends, support for the direct-access resource type name will be discontinued.

Checklist ✅

• Have you included a description of this change?
• Have you updated the relevant documentation to reflect this change?
• Have you made sure CI is passing before requesting a review?

Ticket

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[yoonho]

Approved for merging

[ohtanim]

@awennersteen @OkuyanBoga You were asked to review this PR based on the current CODEOWNERS file. As I described in our slack channel, this PR addresses the API name changes for IBM Direct Access API. You can ignore PR review request.

Proceeding to merge.