(core) annotate shares listed in UserManager for documents

Summary:
This gives more guidance to users when editing document shares in the UserManager dialog.

  * For a document on a team site, any shares with team members are marked `Team member`.
  * Shares that count as external collaborators are marked for documents on a team or personal site as `collaborator` (personal site) or `outside collaborator` (team site).
  * Collaborators are marked `1 of 2`, `2 of 2`, and then `limit exceeded`.
  * On a team site, links are offered for each collaborator to add them to the team. The links lead to a prefilled dialog for managing team membership which can be confirmed immediately, allowing the user to continue without interruption.
  * On a personal site, for the last collaborator and beyond, a link is added for creating a team. This isn't seamless since creating a team involves billing etc.

There's a small unrelated tweak in tests to remove a confusing import from `test/browser` in `test/server`.

One thing I didn't get to is checking if owner of doc is owner of site. If they aren't, they may try to add a member and be denied at that point - it would be more polite to change messaging earlier for them.

Test Plan: added and updated tests

Reviewers: georgegevoian

Reviewed By: georgegevoian

Differential Revision: https://phab.getgrist.com/D3083

app/client/ui/DocMenu.ts

@@ -431,6 +431,8 @@ export function makeDocOptionsMenu(home: HomeModel, doc: Document, renaming: Obs
       resourceType: 'document',
       resourceId: doc.id,
       linkToCopy: urlState().makeUrl(docUrl(doc)),
+      reload: () => api.getDocAccess(doc.id),
+      appModel: home.app,
     });
   }