refactor(server)!: remove redundant error and statusCode fields from error responses (#28140)

* refactor(server)!: remove redundant error and statusCode fields from error responses

* use enum

* enhance response management

* chore: clean up header

* fix: chaining

* refactor: handle error

* fix e2e tests

---------

Co-authored-by: Jason Rasmussen <jason@rasm.me>

e2e/src/specs/server/api/oauth.e2e-spec.ts

@@ -332,9 +332,7 @@ describe(`/oauth`, () => {
       const { status, body } = await request(app).post('/oauth/callback').send(callbackParams);
       expect(status).toBe(500);
       expect(body).toMatchObject({
-        error: 'Internal Server Error',
         message: 'Failed to finish oauth',
-        statusCode: 500,
       });
     });
 
@@ -495,11 +493,10 @@ describe(`/oauth`, () => {
     });
 
     it('should reject OAuth discovery over HTTP', async () => {
-      const { status, body } = await request(app)
+      const { status } = await request(app)
         .post('/oauth/authorize')
         .send({ redirectUri: 'http://127.0.0.1:2285/auth/login' });
       expect(status).toBe(500);
-      expect(body).toMatchObject({ statusCode: 500 });
     });
   });
 });