Examples: Fix or remove conjugateGradientMultiBlockCG_test.py

[mdboom]

Is this a duplicate?

• I confirmed there appear to be no duplicate issues for this request and that I agree to the Code of Conduct

Area

cuda.bindings

Is your feature request related to a problem? Please describe.

This example has been effectively disabled since 2021 "due to a bug in NVRTC".

Describe the solution you'd like

If it can be easily fixed (or the bug in NVRTC no longer exists), let's re-enable it. If it's not easy, let's just remove the example, since it's not providing any value.

Describe alternatives you've considered

No response

Additional context

No response