Remove unused opam template #944

Job	Run time
lint-opam	2m 52s
build-and-test (ubuntu-latest, 4.08, true)	3m 1s
build-and-test (ubuntu-latest, 4.08, false)	2m 44s
build-and-test (ubuntu-latest, 4.09, true)	3m 24s
build-and-test (ubuntu-latest, 4.09, false)	3m 1s
build-and-test (ubuntu-latest, 4.10, true)	2m 44s
build-and-test (ubuntu-latest, 4.10, false)	3m 22s
build-and-test (ubuntu-latest, 4.11, true)	3m 48s
build-and-test (ubuntu-latest, 4.11, false)	2m 17s
build-and-test (ubuntu-latest, 4.12, true)	3m 44s
build-and-test (ubuntu-latest, 4.12, false)	2m 39s
build-and-test (ubuntu-latest, 4.13, true)	3m 18s
build-and-test (ubuntu-latest, 4.13, false)	2m 32s
build-and-test (ubuntu-latest, 4.14, true)	3m 17s
build-and-test (ubuntu-latest, 4.14, false)	3m 14s
build-and-test (ubuntu-latest, 5.0, true)	4m 33s
build-and-test (ubuntu-latest, 5.0, false)	2m 42s
build-and-test (ubuntu-latest, 5.1, true)	3m 20s
build-and-test (ubuntu-latest, 5.1, false)	3m 21s
build-and-test (ubuntu-latest, 5.2, true)	4m 0s
build-and-test (ubuntu-latest, 5.2, false)	3m 9s
build-and-test (ubuntu-latest, ocaml-variants.5.2.0+options,ocaml-option-flambda,ocaml-option-mus...	3m 36s
build-and-test (macos-latest, 5.2, false)	3m 32s
build-and-test (windows-latest, 5.2, false)	6m 14s
	1h 20m 24s

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