Complete removal of `SplitResult` as an internal #2520

Job	Run time
⚙️ Pre-set global build settings	1s
lint / Linter	1m 31s
📦 Build distribution packages	11s
📦 Build wheels for tested arches / Build wheels on macos	1m 55s
📦 Build wheels for tested arches / Build wheels on windows	1m 32s
📦 Build wheels for tested arches / Build wheels on ubuntu	1m 56s
Test	1s
Benchmark	1s
Test matrix status	4s
Pre-Deploy	1s
📦 Build wheels for odd arches${{ '' }}	1s
Deploy	1s
	7m 15s

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