addons-linter was patched before to emit only a warning when background.service_worker is used without scripts/page (#5152). The warnings are still not very helpful.

Instead of a generic "/background/service_worker" is not supported.", we should print a helpful message that encourages the use of scripts. For more details on why and what, see my write-up for web-ext run at mozilla/web-ext#3101

The relevant implementation was last touched for #5152, at

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