[`refurb`] Handle non-finite decimals in `verbose-decimal-constructor (FURB157)` (#14596)
This PR extends the Decimal parsing used in [verbose-decimal-constructor
(FURB157)](https://docs.astral.sh/ruff/rules/verbose-decimal-constructor/)
to better handle non-finite `Decimal` objects, avoiding some false
negatives.
Closes #14587
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Co-authored-by: Micha Reiser <micha@reiser.io>