Add 800+ Extended Test Case Variants

[weiyuanyue]

This pull request aims to merge over 800 extended test case variants into the upstream repository. These variants have been created using the first 2 methods outlined in Test Case Variant Extension document:

1. Instruction-Only Modification: This method generates new test variants by modifying only the natural language instructions while keeping the test steps and expected results unchanged.
2. Instruction and Evaluator Result (JSON) Modification: This method creates variants by changing both instructions and expected results in JSON format, while maintaining constant test steps.

[weiyuanyue]

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