refactor: drop backward compatible templates #768

Job	Run time
build (macos-14, module-legacy, kotlin-swift, auto)	2m 19s
build (macos-14, module-legacy, cpp, auto)	6m 50s
build (macos-14, module-legacy, kotlin-objc, auto)	8m 55s
build (macos-14, module-new, kotlin-objc, auto)	10m 50s
build (macos-14, module-new, cpp, auto)	8m 0s
build (macos-14, view-legacy, kotlin-swift, auto)	2m 36s
build (macos-14, view-legacy, kotlin-objc, auto)	2m 26s
build (macos-14, view-new, kotlin-objc, auto)	4m 48s
build (ubuntu-latest, library, js, auto)	2m 12s
build (ubuntu-latest, module-legacy, kotlin-swift, auto)	1m 24s
build (ubuntu-latest, module-legacy, cpp, auto)	4m 1s
build (ubuntu-latest, module-legacy, kotlin-objc, auto)	3m 9s
build (ubuntu-latest, module-new, cpp, auto)	3m 18s
build (ubuntu-latest, module-new, kotlin-objc, auto)	3m 27s
build (ubuntu-latest, view-legacy, kotlin-swift, auto)	1m 26s
build (ubuntu-latest, view-legacy, kotlin-objc, auto)	3m 12s
build (ubuntu-latest, view-new, kotlin-objc, auto)	3m 2s
	1h 11m 55s

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