fix: broken attach and attach another button for searchable associations

[ObiWanKeoni]

Description

I think this is all that's necessary to fix the issue linked below. In the AssociationsController, we expect a :turbo_frame param to be passed to the route if we want to rerender the turbo frame instead of closing it. The only bit I'm unclear on is whether we need to have additional special handling for the attach_another button. I figured this was enough.

Fixes #3456

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

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