Add yatchew_hr_test(null='mean_independence') mode #1650

Job	Run time
Pure Python Fallback	1h 16m 39s
Rust Unit Tests (macos-latest)	1m 5s
Rust Unit Tests (ubuntu-latest)	1m 21s
Rust Unit Tests (windows-latest)	2m 4s
Rust Unit Tests (ubuntu-24.04-arm)	1m 30s
Python Tests (ubuntu-latest, py3.11)	57m 32s
Python Tests (macos-latest, py3.13)	25m 41s
Python Tests (windows-latest, py3.14)	52m 9s
Python Tests (ubuntu-24.04-arm, py3.11)	33m 39s
Python Tests (ubuntu-latest, py3.13)	51m 14s
Python Tests (macos-latest, py3.14)	27m 7s
Python Tests (windows-latest, py3.11)	35m 48s
Python Tests (ubuntu-latest, py3.14)	54m 13s
Python Tests (ubuntu-24.04-arm, py3.13)	34m 8s
Python Tests (windows-latest, py3.13)	50m 17s
Python Tests (macos-latest, py3.11)	29m 1s
Python Tests (ubuntu-24.04-arm, py3.14)	34m 48s
	9h 28m 16s

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