Use batch mode correctly in the tutorials

[garrison]

Apparently, if you use sampler = SamplerV2(backend=backend), even within the Batch context manager, Qiskit Runtime will use job mode instead of batch mode, without any warning. This fixes our example usage so batch mode will work properly.

[coveralls]

Pull Request Test Coverage Report for Build 9326577472

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 9322309456:	0.0%
Covered Lines:	2401
Relevant Lines:	2401

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💛 - Coveralls

[garrison]

I tested with QiskitRuntimeService, and a session was indeed created. But CI fails because it no longer works on a fake backend, in local mode.

[ibrahim-shehzad]

even within the Batch context manager, Qiskit Runtime will use batch mode instead of job mode, without any warning.

Did you mean Qiskit Runtime will use job mode instead of batch mode when this is the case? This was what I was running into.

[garrison]

even within the Batch context manager, Qiskit Runtime will use batch mode instead of job mode, without any warning.

Did you mean Qiskit Runtime will use job mode instead of batch mode when this is the case? This was what I was running into.

I did. I fixed it in the top comment.

[ibrahim-shehzad]

I think this looks good, thanks! I'm guessing we will change to

with Batch(backend=backend) as batch: 
    sampler = SamplerV2(mode=batch)

after runtime makes that change and backport that?

[garrison]

I'm guessing we will change to

with Batch(backend=backend) as batch: 
    sampler = SamplerV2(mode=batch)

after runtime makes that change and backport that?

It probably won't be a candidate for backporting, as I expect it to require us to bump the minimum required version of qiskit-ibm-runtime.