#42951 fix: check role permissions when managing team members

Proposed changes (including videos or screenshots)

teams.updateMember and teams.addMembers now validate the roles they accept and check the same role permissions as the other role-assignment paths.

Issue(s)

Steps to test or reproduce

See the new cases under /teams.updateMember in apps/meteor/tests/end-to-end/api/teams.ts.

Further comments