Enable the use of IBM Quantum platform (cloud) tokens for login

[cbjuan]

Description

This PR enables the extension to use the tokens located in the default-ibm-quantum-platform section of the ~/.qiskit/qiskit-ibm.json file for authentication with the tokens from the new IBM Quantum cloud platform. As of today, the tokens from that new platform (https://quantum.cloud.ibm.com) and the classic one (https://quantum.ibm.com) can be used, but after July 1st, the tokens from the classic one will not be useful.

Linked Issue(s)

Fixes #26

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Local testing with the extension installed in dev mode

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[vabarbosa]

thank you

[ajbozarth]

IIUC the token name is changing and we just need to support the new token name?

If so this LGTM

[ajbozarth]

Also I looked into the CI failures and opened #28 if you want to review and merge that then rebase this so the CI can run

[cbjuan]

IIUC the token name is changing and we just need to support the new token name?

If so this LGTM

Yes, for the cloud environment basically there is a new entry in the JSON file with the same structure and basically changes the name, so the change is pretty basic.