[Python] floor_temporal and ceil_temporal bugs on DST changeover.
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Component: Python
Type: bug
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Description
### Describe the bug, including details regarding any error messages, version, and platform.
When running a `ceil_temporal` operation that results in a timestamp hitting the spring leap forward point, pyarrow errors out with 'Local time does not exist'. Similar during the fall back switchover, both floor_temporal and ceil_temporal will error with 'Local time is ambiguous'.
Observed with pyarrow 19.0.1 on MacOS/arm64 and Linux/amd64.
### Component(s)
Python
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