Backport: "fix(invite): prevent guest email invites when guest access is disabled"

Tim Raphael Spamerrequested to merge
t.spamer/web-app:backport/prevent-guest-invites-when-guest-access-is-disabled into release/v2.8.x

fix(invite): prevent guest email invites when guest access is disabled

Closes #3430 (closed)

(cherry picked from commit 584a3e11)

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