Add survey R cross-validation: TSL variance vs R survey::svyglm #704

Job	Run time
Pure Python Fallback	58m 4s
Rust Unit Tests (ubuntu-24.04-arm)	1m 33s
Rust Unit Tests (windows-latest)	2m 1s
Rust Unit Tests (ubuntu-latest)	1m 21s
Rust Unit Tests (macos-latest)	1m 28s
Python Tests (windows-latest, py3.11)	40m 24s
Python Tests (ubuntu-latest, py3.13)	40m 29s
Python Tests (macos-latest, py3.11)	18m 41s
Python Tests (macos-latest, py3.13)	21m 48s
Python Tests (windows-latest, py3.13)	38m 47s
Python Tests (ubuntu-24.04-arm, py3.11)	18m 31s
Python Tests (ubuntu-latest, py3.11)	39m 28s
Python Tests (ubuntu-24.04-arm, py3.13)	18m 38s
	5h 1m 13s

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