Remove jackknife variance estimation from TROP #187

Job	Run time
Pure Python Fallback	57m 57s
Rust Unit Tests (macos-latest)	1m 42s
Rust Unit Tests (ubuntu-latest)	1m 6s
Python Tests (ubuntu-latest)	7m 57s
Python Tests (macos-latest)	7m 27s
Rust Unit Tests (windows-latest)	5m 26s
Python Tests (windows-latest)	13m 2s
	1h 34m 37s

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