Change warning annotations to notices regarding ignored inputs

[Vanley]

When input parameter is ignored, annotation should just inform about it.

Available annotations on the github actions (https://github.com/actions/toolkit/tree/main/packages/core):

[ento]

I think this can be even deleted altogether. base is used now when the action is triggered by a pull request event.

paths-filter/src/main.ts

Line 109 in de90cc6

return await git.getChanges(base || baseSha || defaultBranch, currentRef)

Commit that switched to this behavior: 5266f0a

[ento]

This can be deleted too, I think. I don't see any if clause here that evaluates base === git.HEAD like for the return statement above.

paths-filter/src/main.ts

Lines 80 to 85 in de90cc6

	if (base === git.HEAD) {
	if (ref) {
	core.warning(`'ref' input parameter is ignored when 'base' is set to HEAD`)
	}
	return await git.getChangesOnHead()
	}