[FEA]: Avoid importing pytest in all cuda_bindings/examples

[rwgk]

Is this a duplicate?

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Area

cuda.bindings

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

xref: #1517 (comment)

Describe the solution you'd like

All examples should be runnable standalone. If an end user runs the example, and the headers are not found, then they'd hit this pytest import which may or may not fail right away, and even if it succeeds the next error message (coming from skip) would be confusing (they'd see "Skipped").

Describe alternatives you've considered

No response

Additional context

No response