refactor(server)!: structured validation error responses (#28204)

* refactor(server)!: structured validation error responses

* refactor(server): clarify comment on removing duplicate HTTP response fields

* enhance validation error tests

* make path and message required

* fmt

* fix e2e test

* fmt

* feat: enhance error handling in getServerErrorMessage function

server/test/medium/responses.ts

@@ -25,6 +25,10 @@ export const errorDto = {
   badRequest: (message: any = null) => ({
     message: message ?? expect.anything(),
   }),
+  validationError: (errors?: ReadonlyArray<{ path: ReadonlyArray<string | number>; message: string }>) => ({
+    message: 'Validation failed',
+    errors: errors ? expect.arrayContaining(errors.map((e) => expect.objectContaining(e))) : expect.any(Array),
+  }),
   noPermission: {
     message: expect.stringContaining('Not found or no'),
   },