bowling: Use Tera template for tests #2771

Job	Run time
Check compilation (stable)	4s
Run shellcheck on scripts	3s
Check compilation (beta)	10s
configlet lint	4s
Clippy	8s
markdown lint	14s
Check Rust Formatting	22s
Run repository tests	16s
Check exercises on nightly (benchmark enabled)	11s
	1m 32s

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