Add deprecation warning

[kt474]

Summary

fixes #1042

Details and comments

[kt474]

@rathishcholarajan can you take a look

[kt474]

@renier

[mtreinish]

So I'm a bit confused here, what is the status of qiskit-ibm-provider if we're telling people to use the runtime client instead? They're not equivalent sets of functionality. I get you're adding an interface for doing backend.run() via the circuit runner, but is that all that's needed? What about the other IQX api functionality? Also what about the in progress PRs like: Qiskit/qiskit-ibm-provider#365 ?

[kt474]

So I'm a bit confused here, what is the status of qiskit-ibm-provider if we're telling people to use the runtime client instead? They're not equivalent sets of functionality. I get you're adding an interface for doing backend.run() via the circuit runner, but is that all that's needed? What about the other IQX api functionality? Also what about the in progress PRs like: Qiskit/qiskit-ibm-provider#365 ?

@renier - also unsure about the exact plan for this repo qiskit-ibm-provider

[1ucian0]

I get you're adding an interface for doing backend.run() via the circuit runner, but is that all that's needed?

For reference Qiskit/qiskit-ibm-runtime#459

[jyu00]

Putting on hold label back on. Like Matthew said we shouldn't deprecate this until there is a replacement.

[1ucian0]

FutureWarning?

[1ucian0]

I just created ibm.biz/provider_migration_guide, which is shorter and can be updated if the url changes. Maybe a better option?

Suggested change

	"https://qiskit.org/documentation/partners/qiskit_ibm_provider/tutorials/Migration_Guide_from_qiskit-ibmq-provider.html"
	"https://ibm.biz/provider_migration_guide"

[HuangJunye]

Just FYI the original link was added to the release note of Qiskit/qiskit#8080. If the url changes, we can consider change there as well.

[HuangJunye]

But probably the best way to handle the link change would be redirect the original link to the new link. This can be done in sphinx using reredirect extension. Anyway, we don't need to worry about that now.