User Role Revamp

Description

Currently, admins have to add users as members (one at a time) and then add them as members of their team. Similarly, if they want to add leads or heads to a team, they must first grant them the required role (they won't even show up in the multi-select before this happens). We need to make this much more seamless and less tedious.

Acceptance Criteria

• Users can gain required role as they are given a "team role" (member/lead/head)
• The current rules regarding role escalation apply (i.e. if i don't have permission to upgrade someone's role, they will still be filtered out as an option in the Team form
• Multiple users can be added to a team at once (with their roles updated, as needed)

Proposed Solution

If a user is able to promote users, don't filter out users in the member/lead/head fields on the Team form. Instead, promote users as needed if they're added as members/leads/heads/ on a team.

Mocks

No response

Start with the Team form and the existing user-role escalation and filtering rules. Trace how team members, leads, and heads are selected and updated, then verify that permitted users can be added in bulk with the required role changes while unauthorized promotions remain unavailable.