[Single File] Fix configuring scheduler via legacy kwargs

[DN6]

What does this PR do?

Legacy kwargs prediction_type and scheduler_type will not be configured in single file loading if an appropriate model config is present in the users cache. This leads bad samples being generated if the user would like to change the prediction type for a particular model.

This PR:

1. Adds an additional check to trigger legacy scheduler loading when these kwargs are passed in
2. Updates the deprecation message for these kwargs with examples to show how we expect the schedulers to be configured in single file loading going forward.

Fixes # (issue)
#9171

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[yiyixuxu]

thanks!