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GH-41039: [Python] ListView pandas tests should use np.nan instead of None (#41040)

### Rationale for this change

ListView pandas conversion tests are failing in upstream development branches of pandas/numpy.

### What changes are included in this PR?

* Use np.nan instead of None when comparing with an expected Pandas Series.

### Are these changes tested?

Yes, unit tests updated.

### Are there any user-facing changes?

No.
* GitHub Issue: #41039

Authored-by: Dane Pitkin <dane@voltrondata.com>
Signed-off-by: AlenkaF <frim.alenka@gmail.com>