Sa/mspca 2 get volunteer by id and update volunteer by

[shreeyaadhikari]

ℹ️ Issue

Closes MSPCA-2

📝 Description

Adds the ability for foster coordinators to look up a single volunteer's full details by ID and update their info without overwriting the entire record.

Briefly list the changes made to the code:

1. Added GET /volunteers/:volunteerId which returns a single volunteer's full details, or a 404 if the ID doesn't exist.
2. Added PATCH /volunteers/:volunteerId which updates only the fields provided in the request body, leaving the rest of the record untouched.
3. Added UpdateVolunteerDto with address, city, zipcode, homebase, residentAnimals, notes, and fosterType as editable, optional fields, with @ IsEnum() validation on homebase and fosterType to restrict them to their real enum values.
4. Added assignedCoordinatorId handling in the update flow. The DTO accepts a coordinator ID rather than a full nested object
5. Added validateId checks in VolunteersController for both endpoints, returning a 400 for invalid IDs.
6. Added service and controller tests for both endpoints

✔️ Verification

Ran yarn test. All service and controller tests pass for VolunteersService and VolunteersController.

🏕️ (Optional) Future Work / Notes

Did you notice anything ugly during the course of this ticket? Any bugs, design challenges, or unexpected behavior? Write it down so we can clean it up in a future ticket!

[dburkhart07]

A lot of just small nits and general style guidelines that we will follow throughout development. Logic looks really great so far. Ty Shreeya!!!! 🐼

[dburkhart07]

I don't think we need this file or the install-state.gz. Can you try deleting these and then running yarn install to see if it reinstalls them? If not, let's keep them removed.

[shreeyaadhikari]

I'm not quite sure how to delete these from the PR.