chore(server): remove user count endpoint (#4724)

* chore: remove unused endpoint

* chore: open api

server/src/domain/user/dto/index.ts

@@ -1,4 +1,3 @@
 export * from './create-profile-image.dto';
 export * from './create-user.dto';
 export * from './update-user.dto';
-export * from './user-count.dto';

server/src/domain/user/dto/user-count.dto.ts

@@ -1,13 +0,0 @@
-import { Transform } from 'class-transformer';
-import { IsBoolean } from 'class-validator';
-import { Optional } from '../../domain.util';
-
-export class UserCountDto {
-  @IsBoolean()
-  @Optional()
-  @Transform(({ value }) => value === 'true')
-  /**
-   * When true, return the number of admins accounts
-   */
-  admin?: boolean = false;
-}