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GH-35728: [CI][Python] Move test_total_bytes_allocated to a subprocess to improve reliability (#36355)

### Rationale for this change

Currently some conda and wheels jobs are failing due to this error:

```
 =================================== FAILURES ===================================
__________________________ test_total_bytes_allocated __________________________

    def test_total_bytes_allocated():
>       assert pa.total_allocated_bytes() == 0
E       assert 1216 == 0
E        +  where 1216 = <built-in function total_allocated_bytes>()
E        +    where <built-in function total_allocated_bytes> = pa.total_allocated_bytes
```

### What changes are included in this PR?

As suggested on the issue trying to move this test to a subprocess to see if it improves reliabilit.

### Are these changes tested?

Archery and CI

### Are there any user-facing changes?

No
* Closes: #35728

Authored-by: Raúl Cumplido <raulcumplido@gmail.com>
Signed-off-by: Raúl Cumplido <raulcumplido@gmail.com>