Some old code doesn't respect the definition of `RequireSignInView` (the
`ignSignIn` is forgotten).
After #24413, this PR will do more fixes, ~~and rename the strange
`ignSignIn` to `optSignIn`.~~
This PR is ready for review, I think we can postpone the "ignSignIn"
renaming to another, to make this PR simple and clear.
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Co-authored-by: Giteabot <teabot@gitea.io>