Remove collapsible toggle for conditional update risk details

Description of problem:

When a user selects a supported-but-not-recommended update target, it's currently rendered as a DropdownWithSwitch that is collapsed by default. That forces the user to perform an extra click to see the message explaining the risk they are considering accepting. We should remove the toggle and always expand that message, because understanding the risk is a critical part of deciding whether you accept it.

Version-Release number of selected component (if applicable):

Since console landed support for conditional update risks. Not a big enough deal to backport that whole way.

How reproducible:

Every time.

Steps to Reproduce:

OTA-520 explains how to create dummy data for testing the conditional update UX pre-merge and/or on nightly builds that are not part of the usual channels yet.

Actual results:

Expected results:

but without the down-v, because the text should not be collapsible.