MoreCast 2.0: Admin Panel/Assigning Forecaster Role

**As a** User Type/Persona
**I need** Feature/enhancement
**So That** Value, why is this needed, what does the user need to accomplish

As the Lead Forecaster, I would like to have the ability to assign the forecaster role to new staff or contractors.

**Acceptance Criteria**
- [ ] Given (Context), When (action carried out), Then (expected outcome)
- [ ] Given (Context), When (action carried out), Then (expected outcome)

**Additional Context**
- enter text here
- enter text here

**Definition of Done**
https://github.com/bcgov/wps/wiki/Definition-of-Done

The issue names no files, tests, or entry points, and its acceptance criteria are still placeholders. First identify the existing admin-panel and forecaster-role flows, then clarify the expected permissions and user experience with the maintainers; done criteria must define how assigning the role succeeds and is verified.

Written by the indexing model from the issue text.