[CI] Fix new LoRAHotswap tests

[DN6]

What does this PR do?

New LoRA Hotswap tests are failing because the method used to create dummy_inputs is still the one used in the old tests. Update the tests to use the correct method name.

Fixes # (issue)

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[Copilot]

Pull request overview

This PR fixes failing LoRA Hotswap tests by correcting the method name used to create dummy inputs. The tests were using the old prepare_dummy_input method name instead of the standardized get_dummy_inputs method expected by the test mixins.

Changes:

• Updated method calls from prepare_dummy_input to get_dummy_inputs in the LoRA hotswap test helper function

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