Technical Story: Map roles directly to roles

[MasterEvarior]

Description

Currently the roles are mapped only to calculations. Because one cannot add a new calculations without a role and also cannot add a new role without a calculation, this makes it currently impossible to create new calculations non-associated roles.

The roles should now also be possible to add to a specific user. Each role that is associated with a user, should be displayed as a tab on their page. See image for clarification:

Which roles are associated should be configurable through the member edit page. A user does not need to have a role associated but if no role is associated, no calculcations can be created. The interaction should be done through a multi-select autocomplete.

The database association can be done through a three-way intermediate table.

Acceptance Criteria

• Each user can have 0..n roles
• Each calculation can only have one role
• For each role, a corresponding calculation tab is displayed
• The roles can be selected on the member edit page
• All existing roles/calculations get migrated
• Tests have been written where appropriate

Additional Information

None