Chore/consistent services and error handlers (#2101)

* Update index.ts

* Update buildChatflow.ts

* Update index.ts

* Update index.ts

* Update index.ts

* Update index.ts

* Update index.ts

* Update index.ts

* Update index.ts

* Update index.ts

* Consistency

* Rename ApiError to InternalServerError

* Use InternalFlowiseError in controllers

* Use InternalFlowiseError in services

* Catch routes without preconditioned parameters

* Reconfigure the route precondition checks

* Fix router precondition checks

* cleanup status codes, get proper error messages

---------

Co-authored-by: Henry <hzj94@hotmail.com>

packages/server/src/middlewares/errors/index.ts

@@ -1,10 +1,10 @@
 import { NextFunction, Request, Response } from 'express'
 import { StatusCodes } from 'http-status-codes'
-import { ApiError } from '../../errors/apiError'
+import { InternalFlowiseError } from '../../errors/internalFlowiseError'
 
 // we need eslint because we have to pass next arg for the error middleware
 // eslint-disable-next-line
-async function errorHandlerMiddleware(err: ApiError, req: Request, res: Response, next: NextFunction) {
+async function errorHandlerMiddleware(err: InternalFlowiseError, req: Request, res: Response, next: NextFunction) {
     let displayedError = {
         statusCode: err.statusCode || StatusCodes.INTERNAL_SERVER_ERROR,
         success: false,