[MERGE][TRANSFORMATIONS] Fixed RoPEFusionQwen transformation (#31720)

[mryzhov]

Details:

• Added support of different split outputs in the transformation
• improved unit tests

Tickets:

• CVS-171208
• CVS-170840

[Copilot]

Pull Request Overview

This PR fixes the RoPEFusionQwen transformation by adding support for different split outputs and improving unit tests. The transformation was previously hardcoded to handle specific split output indices, but now dynamically determines which QKV component (query or key) is being processed.

• Replaced hardcoded split output ID parameter with dynamic detection of split output index
• Refactored test to be parameterized and test both query (index 0) and key (index 1) components
• Improved test readability by using cleaner variable names and better comments

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
fuse_rotary_positional_embeddings.hpp	Removed split_output_id parameter from RoPEFusionQwen constructor
fuse_rotary_positional_embeddings.cpp	Updated transformation to dynamically detect split output index and removed duplicate pass registrations
fuse_rotary_positional_embeddings.cpp (test)	Converted test to parameterized format and improved readability with better variable names

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