Remove code for unused template param detection. #2264

Job	Run time
Test Rust nightly	8m 33s
Test Rust beta	10m 10s
Examples Rust nightly	3m 42s
Clippy	3m 12s
Examples Rust beta	5m 57s
Examples Rust stable	4m 34s
Test Rust stable	10m 40s
Examples macOS	3m 45s
Docs	3m 41s
Test macOS	15m 40s
Examples Windows (gnu)	6m 9s
Test Windows (msvc)	14m 11s
Examples Windows (msvc)	4m 57s
Format	13s
Test forcing wrapper generation	10m 57s
Outdated	13s
Address Sanitizer	19m 9s
	2h 5m 43s

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