Simplify and update `verify-templating.yml` #349

Job	Run time
Generate Jobs	42s
bookworm-curl, bookworm-scm, bookworm	1m 7s
bullseye-curl, bullseye-scm, bullseye	58s
sid-curl, sid-scm, sid	1m 8s
trixie-curl, trixie-scm, trixie	1m 6s
focal-curl, focal-scm, focal	1m 24s
jammy-curl, jammy-scm, jammy	1m 4s
noble-curl, noble-scm, noble	1m 19s
oracular-curl, oracular-scm, oracular	57s
	9m 45s

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