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()
	}

[Vanley]

thanks @ento for review

Will keep this pr short and sweet about the github annotation and information feedback during the github action run.

If you are more familiar with the project and improvements which can be made around it, please create separate pr with those changes! Cheers!