Invite modal doesn't open in the create menu

In Invite modal not working when new nav is enabled (#393653 - closed) we addressed the issue of the invite modal not opening at all, but it still doesn't open when clicking on the item in the create menu. We should add that functionality.

Note: When we created this menu initially, the link took you to the members page. This was changed for the current nav, but didn't make it to the new navigation.

See the aforementioned issue and !113534 (merged) for some inspiration on how to solve this one.