Sayali: add test endpoint for setting user teamCode

[sayali-2308]

Description

Adds a test endpoint to support testing of Task #14 (PRIORITY MEDIUM): Show the number of team members next to team name in 'PR Action Done' bar charts.

This endpoint allows testers to assign a teamCode to a user profile without needing direct MongoDB access, enabling verification that member counts update correctly in the PR Action Done chart.

Implements # 14 (Priority Medium - PR Review Team Analytics Dashboard - PR Insights Frontend)

Related PRs (if any):

This backend PR is related to the frontend PR OneCommunityGlobal/HighestGoodNetworkApp#4864
To test this backend PR you need to checkout the frontend PR Sayali_Add_Member_Count_To_PR_Actions_Chart.

Main changes explained:

• Created src/routes/testRoutes.js — adds a POST endpoint /api/test/set-team-code that updates a user's teamCode field by userId, used for testing member count display in the PR Action Done chart
• Updated src/app.js to register the test route

How to test:

1. Check out current branch: Sayali_Add_Member_Count_To_PR_Actions_Chart
2. Run npm run build and npm run start to run the backend locally
3. Get auth token via Postman:
   • POST http://localhost:4500/api/login
   • Body: { "email": "devadmin@hgn.net", "password": "#############" }
4. Get a valid userId:
   • GET http://localhost:4500/api/userprofile with Bearer token
   • Copy any _id from the response
5. Call the test endpoint:
   • POST http://localhost:4500/api/test/set-team-code
   • Body: { "userId": "<copied_id>", "teamCode": "Team E" }
6. Verify response returns success: true with updated user showing teamCode: "Team E"
7. Now check the frontend PR — Team E should show ① in the PR Action Done chart after hard refresh

Screenshots or videos of changes:

Get userprofile

Set-team-code

Check pr-review-insights

Note:

• This endpoint is intended for testing purposes only to help testers verify the member count feature without requiring direct MongoDB access.
• The endpoint requires a valid auth token to access.