What is the expected feature or enhancement?

We currently have the following environment variables after porting code from qiskit-ibm.
QISKIT_IBM_RUNTIME_API_URL
QISKIT_IBM_RUNTIME_API_TOKEN
QISKIT_IBM_RUNTIME_HGP
QISKIT_IBM_RUNTIME_PRIVATE_HGP
QISKIT_IBM_RUNTIME_DEVICE
QISKIT_IBM_RUNTIME_USE_STAGING_CREDENTIALS
QISKIT_IBM_RUNTIME_STAGING_API_TOKEN
QISKIT_IBM_RUNTIME_STAGING_API_URL
QISKIT_IBM_RUNTIME_STAGING_DEVICE
QISKIT_IBM_RUNTIME_STAGING_PRIVATE_HGP

Once we add support for IBM Cloud authentication we should have the below environment variables.

Cloud (Production)

QISKIT_IBM_CLOUD_API_LOCATOR
QISKIT_IBM_CLOUD_API_TOKEN
QISKIT_IBM_CLOUD_DEVICE

Cloud (Staging)

QISKIT_IBM_CLOUD_USE_STAGING_CREDENTIALS
QISKIT_IBM_CLOUD_STAGING_API_LOCATOR
QISKIT_IBM_CLOUD_STAGING_API_TOKEN
QISKIT_IBM_CLOUD_STAGING_DEVICE

Legacy (Production)

QISKIT_IBM_API_TOKEN
QISKIT_IBM_API_LOCATOR
QISKIT_IBM_HGP
QISKIT_IBM_PRIVATE_HGP
QISKIT_IBM_DEVICE

Legacy (Staging)

QISKIT_IBM_USE_STAGING_CREDENTIALS
QISKIT_IBM_STAGING_API_TOKEN
QISKIT_IBM_STAGING_API_LOCATOR
QISKIT_IBM_STAGING_HGP
QISKIT_IBM_STAGING_PRIVATE_HGP
QISKIT_IBM_STAGING_DEVICE