Add course team member

[diana-villalvazo-wgu]

Description

As part of this PR instructors are able to assign a role to a user.

Supporting information

Closes #104

Testing instructions

Please provide detailed step-by-step instructions for manually testing this change.

Other information

Include anything else that will help reviewers and consumers understand the change.

• Does this change depend on other changes elsewhere?
• Any special concerns or limitations? For example: deprecations, migrations, security, or accessibility.

Best Practices Checklist

We're trying to move away from some deprecated patterns in this codebase. Please
check if your PR meets these recommendations before asking for a review:

• Any new files are using TypeScript (.ts, .tsx).
• Deprecated propTypes, defaultProps, and injectIntl patterns are not used in any new or modified code.
• Tests should use the helpers in src/testUtils.tsx (specifically initializeMocks)
• Use React Query to load data from REST APIs. See any apiHooks.ts in this repo for examples.
• All new i18n messages in messages.ts files have a description for translators to use.
• Imports avoid using ../. To import from parent folders, use @src, e.g. import { initializeMocks } from '@src/testUtils'; instead of from '../../../../testUtils'

[openedx-webhooks]

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[codecov]

Codecov Report

❌ Patch coverage is 70.37037% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.32%. Comparing base (2987e23) to head (739a5fc).

Files with missing lines	Patch %	Lines
src/courseTeam/data/apiHook.ts	16.66%	5 Missing ⚠️
src/courseTeam/CourseTeamPage.tsx	62.50%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #133      +/-   ##
==========================================
- Coverage   83.60%   83.32%   -0.29%     
==========================================
  Files         101      102       +1     
  Lines        1226     1253      +27     
  Branches      278      284       +6     
==========================================
+ Hits         1025     1044      +19     
- Misses        194      202       +8     
  Partials        7        7              

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