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GH-50348: [C++] Fix duplicate keys issue in `KeyValueMetadata` #58986

Job	Run time
AMD64 Conda Python 3.10 Pandas 1.3.4	6m 28s
AMD64 Windows 2022 Python 3.13	9m 36s
AMD64 Conda Python 3.13 Pandas latest	7m 6s
AMD64 macOS 15-intel Python 3	17m 30s
ARM64 macOS 14 Python 3	22m 50s
AMD64 Conda Python 3.12 without NumPy	7m 43s
AMD64 Conda Python 3.11 Without Pandas	5m 38s
AMD64 Conda Python 3.11 Sphinx & Numpydoc	19m 52s
	1h 36m 43s