Fetch coaching sessions for selecting the coaching session to join

[jhodapp]

Description

Adds a new CoachingSession type to reflect the backend Rust type and fetches 2 months (1 back, 1 forward) worth of sessions and display in the dashboard's select component. Allows the user to select a session to join.

Note: This PR requires the following backend changes to function correctly.

GitHub Issue: N/A

Changes

• Adds a new CoachingSession type that reflects the backend Rust type
• Fetches 2 months (1 back, 1 forward from now) worth of sessions
• Display these sessions in the select component on the dashboard page
• Allows the user to select and then join a valid coaching session (navigates to that page)

Screenshots / Videos Showing UI Changes (if applicable)

Dashboard with coaching sessions displayed:

Coaching sessions page with endpoint shown in browser address bar:

Testing Strategy

1. Log in and the dashboard will show
2. Select an organization
3. Notice that one list of coaching relationships loads
4. Select a coaching relationship
5. Notice that a list of coaching sessions loads, or if there aren't any, "None found" displays
6. With a valid coaching session chosen, notice that the Join button enables
7. Click the Join button and notice that you're navigated to the /coaching-sessions/<uuid> and the coaching session page renders

Concerns

• Purposefully keeping this PR simpler by not storing all of the dashboard's chosen UUIDs in a Zustand store. This will come in a future PR.

[qafui]

Nice Work!