auth: assign default role. separate group creation from group admin

A newly registered user will have the ability to create a group.

Once a user is a member of a group, either by creating a new group, or being
added to a group, they should not be able to create any more groups, i.e. they
lose the 'create-group' (and/or equivalent) privileges.

This means that the group-administration privileges should be separated from
the group-creation privilege.

* gn3/auth/authorisation/roles.py: assign default roles to user on
  registration
* gn3/auth/authorisation/views.py: assign default roles to user on
  registration
* migrations/auth/20230111_01_Wd6IZ-remove-create-group-privilege-from-group-leader.py:
  separate group-creation role from group-administration role.
* tests/unit/auth/fixtures/user_fixtures.py: Add group-creation role to test
  user
* tests/unit/auth/test_roles.py: Add the group-creation role explicitly in the
  expected results for the test

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