Fix RoPE failures in Transformers nightly

[hmellor]

RoPE config went through a secondary refactor in huggingface/transformers#42255 which:

• Deletes standardize_rope_params and rope_config_validation
• Adds a mixin which is inherited by PreTrainedConfig which does RoPE config patching and validation automatically

Therefore, for Transformers v5 compatibility, this PR:

• Removes any imports of these deleted methods
• Removes manual RoPE config patching for Tranformers v5 in patch_rope_parameters as it's now handled inside PreTrainedConfig

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[gemini-code-assist]

Code Review

This pull request correctly addresses the breaking changes related to RoPE configuration in Transformers v5. The removal of manual patching for transformers>=5.0.0 and the deletion of calls to the now-removed rope_config_validation function align with the library's new automatic handling of RoPE parameters. The changes are clean, well-targeted, and ensure compatibility with upcoming Transformers releases.