Remove dev feature flag from website-backend

[samarpan1738]

Issue Description

We need to remove the dev feature flag for the backend APIs that have been live on prod for more than 14 days.

After going through the APIs where dev feature flag is being, the APIs can be divided in 3 categories

1. All usages of the API (in all repos) are using the dev FF
2. Partial usages of the API (in all repos) are using the dev FF
   1. The dev FF introduces breaking changes
   2. The dev FF does not introduce breaking changes
3. The feature behind the dev FF is being tested in staging/prod

Breaking changes

1. For GET /users API
   • Query param with name query has been renamed to q
2. For Get /users/search API
   • Add pagination when multiple filter is applied and user count greater than 100.

Subtasks

1. For the APIs in category-1
   1. After the dev FF has been removed from website-backend which is an ongoing task
      • remove all dev=true feature flag from the main branch that are on prod for more than 14 days website-backend#2075
   2. Remove the dev FF from all the repos where it's being used (Refer the attached issue for the usages of these APIs)
      • POST /extension-requests
      • POST /discord-actions/nicknames/sync
      • GET /logs API
      • GET /requests
      • GET /extension-requests/self
      • POST /requests
      • PUT /requests/:id
      • GET /tasks
2. For GET /users API (category-2)
   1. Use dev feature flag for GET /users in discord-slash-commands repo
   2. Use dev feature flag for GET /users in members-site repo
   3. Use dev feature flag for GET /users in mobile-app repo
   4. Use dev feature flag for GET /users in website-dashboard repo
   5. Use dev feature flag for GET /users in website-status repo
   6. After the above changes are deployed and tested on prod
      1. Remove dev feature flag for GET /users from website-backend
   7. After the above task is deployed and tested on prod
      1. Remove dev feature flag for GET /users from all the above repos where it was added
3. For GET /users/search API (category-2)
   1. Use dev feature flag for GET /users/search in website-dashboard repo
   2. Use dev feature flag for GET /users/search in discord-slash-commands repo
   3. After the above changes are deployed and tested on prod
      1. Remove dev feature flag for GET /users from website-backend
   4. After the above task is deployed and tested on prod
      1. Remove dev feature flag for GET /users from all the above repos where it was added
4. For GET /users/username (category-3)
   1. Remove dev feature flag from website-backend
   2. Remove dev feature flag from website-my