When searching for the JDK bundled with an unrecognized version of Android Studio, assume the version to be the latest (#125247)

Fixes #125246 by restoring the intended behavior of #101862. That is, when searching for a JDK and we encounter an Android Studio version we don't recognize, assume it to be the latest version `flutter` is aware of.

Also does some light refactoring in the tests, like using test objects instead of referencing `globals`.