Migrate from "auth" to "channel" parameter

[daka1510]

Summary

Removed support for "auth" parameter, added support for "channel" parameter. Based on Qiskit/qiskit-ibm-runtime#226. Unlike qiskit-ibm-runtime, qiskit-ibm-provider does not expose the auth or channel parameter to the user via public APIs because only a single channel (ibm_quantum) is supported. As a result, this change is transparent for users. The migration code is still needed because qiskit-ibm.json is shared with qiskit-ibm-runtime and may include the old auth-based format

Details and comments

#268

[daka1510]

@rathishcholarajan can you add new environments ("ibm-quantum-production", "ibm-quantum-staging") with the known secrets?

[coveralls]

Pull Request Test Coverage Report for Build 2071219523

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 57 of 68 (83.82%) changed or added relevant lines in 7 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.3%) to 36.066%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
qiskit_ibm_provider/accounts/account.py	12	13	92.31%
qiskit_ibm_provider/api/auth.py	1	2	50.0%
qiskit_ibm_provider/api/clients/auth.py	1	2	50.0%
qiskit_ibm_provider/ibm_provider.py	3	4	75.0%
qiskit_ibm_provider/accounts/management.py	36	43	83.72%

Totals
Change from base Build 2071215039:	0.3%
Covered Lines:	1804
Relevant Lines:	5002

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💛 - Coveralls

[rathishcholarajan]

LGTM!

[rathishcholarajan]

@rathishcholarajan can you add new environments ("ibm-quantum-production", "ibm-quantum-staging") with the known secrets?

Done