Test for ActiveStorage x Activerecord::MultiTenant
## Rails 6.0.2.2
```
$ RAILS_VERSION=6.0.2 ruby app.rb
...
1 runs, 1 assertions, 0 failures, 0 errors, 0 skips
```
## Rails 6.0.3
```
$ RAILS_VERSION=6.0.3 ruby app.rb
...
Error:
BugTest#test_eager_load:
NoMethodError: undefined method `relation' for #<Arel::Nodes::BindParam:0x00007fa7bdd653f0>
app.rb:91:in `test_eager_load'
```