Use new API URL

[kt474]

Summary

Use the new API URLs

staging: https://quantum.test.cloud.ibm.com/api
production: https://quantum.cloud.ibm.com/api

Details and comments

Fixes #2147

[ElePT]

Thanks @kt474, it looks like the new URL is already active and working, right? do you see any blocker for this PR or should we go ahead and merge it?

From the release note perspective, I am debating whether we should add an API Changes release note or not. It seems reasonable to document the change, but it's not the definition of "user facing" that I am used to.

[kt474]

Thanks @kt474, it looks like the new URL is already active and working, right? do you see any blocker for this PR or should we go ahead and merge it?

I'll follow up with the IQP side, I think we'll have to do more testing with the the URLs

From the release note perspective, I am debating whether we should add an API Changes release note or not. It seems reasonable to document the change, but it's not the definition of "user facing" that I am used to.

We can document any discrepancies between the APIs that effect the user. But if they're exactly the same then there's no need.

[ElePT]

This PR has been superseded by #2239