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
...
```

tests/integration/auth_ldap_test.go

@@ -332,7 +332,7 @@ func TestLDAPUserSyncWithGroupFilter(t *testing.T) {
 
 	// Assert members of LDAP group "cn=git" are added
 	for _, gitLDAPUser := range te.gitLDAPUsers {
-		unittest.BeanExists(t, &user_model.User{
+		unittest.AssertExistsAndLoadBean(t, &user_model.User{
 			Name: gitLDAPUser.UserName,
 		})
 	}