Refactor tests (#33021)

1. fix incorrect tests, for example: BeanExists doesn't do assert and
shouldn't be used
2. remove unnecessary test functions
3. introduce DumpQueryResult to help to see the database rows during
test (at least I need it)

```
====== DumpQueryResult: SELECT * FROM action_runner_token ======
- # row[0]
  id: 1
  token: xeiWBL5kuTYxGPynHCqQdoeYmJAeG3IzGXCYTrDX
  owner_id: 0
...
```

services/org/user_test.go

@@ -47,7 +47,7 @@ func TestRemoveOrgUser(t *testing.T) {
 
 	testSuccess := func(org *organization.Organization, user *user_model.User) {
 		expectedNumMembers := org.NumMembers
-		if unittest.BeanExists(t, &organization.OrgUser{OrgID: org.ID, UID: user.ID}) {
+		if unittest.GetBean(t, &organization.OrgUser{OrgID: org.ID, UID: user.ID}) != nil {
 			expectedNumMembers--
 		}
 		assert.NoError(t, RemoveOrgUser(db.DefaultContext, org, user))