Project sharing - don't expose access info to external users

Currently when you share a project with an external user, they can click the Share button and see the list of users who have access to the project.
I suggest that this information should only be visible to file owners/team members. The list of names should not be visible to external users both for business and personal privacy reasons.

Screenshot: current functionality - an external user can see list of accounts I have shared my project with.
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