Move V4A checkbox to upload overview

• Move the visible-for-all (V4A, "publicly visible") checkbox from the EditMembersDialog to a new step "Edit visibility and access" in the UploadOverview to reduce confusion about its meaning.
• Place an additional button to open the EditMembersDialog beneath the checkbox.
• Add new icon (red eye) for unpublished uploads that are publicly visible (cf. blue globe for published uploads).
• Disable the checkbox under embargo, reset and disable the embargo selection when the checkbox is checked; both to mitigate GUI problems if an upload is both under embargo and publicly visible.
• Moved and expand tests.
• Bonus: Change phrasing of the edit metadata step. Minor cleanup.

Closes #2079 (closed)