Complete removal of `SplitResult` as an internal #2525

Job	Run time
⚙️ Pre-set global build settings	1s
lint / Linter	1s
📦 Build distribution packages	0s
📦 Build wheels for tested arches${{ '' }}	0s
Benchmark	0s
Test	0s
Test matrix status	1s
Pre-Deploy	0s
📦 Build wheels for odd arches${{ '' }}	0s
Deploy	0s
	3s

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