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
...
```

models/unittest/reflection.go

@@ -4,7 +4,7 @@
 package unittest
 
 import (
-	"log"
+	"fmt"
 	"reflect"
 )
 
@@ -14,7 +14,7 @@ func fieldByName(v reflect.Value, field string) reflect.Value {
 	}
 	f := v.FieldByName(field)
 	if !f.IsValid() {
-		log.Panicf("can not read %s for %v", field, v)
+		panic(fmt.Errorf("can not read %s for %v", field, v))
 	}
 	return f
 }