UX: inform staff users that new users will be auto-approved on invite (PR #11062)

When must_approve_users is enabled then staff users assume that all users will have to be approved manually. But in case of invite we auto-approve users if they are invited by users. This commit adds an info on the bottom of invite modal informing staff users that new users will be auto-approved as soon as they accept invite.

Meta discussion: https://meta.discourse.org/t/how-to-configure-approval-based-sign-ups/112128/11?u=techapj


Screenshot 2020-10-29 at 12 48 11 PM


Those two computed properties are good candidates for replacing with the and() computed helper

Looks good.

Good idea, done!

This removal seem to be missing a matching addition of isAdmin: readOnly(…)?

Good catch, fixed.

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