[google-labs-jules]

Added a mid-operation reset test to the ChaCha20 testbench.

• 🎯 What: The testing gap addressed is the lack of test coverage for asserting a reset mid-operation. The ChaCha20 module needs to properly transition back to IDLE and be ready to process a new block again.
• 📊 Coverage: The scenario tested is resetting the core while it is actively in the RUNNING state (mid-execution).
• ✨ Result: The improvement in test coverage allows confident refactoring knowing that unexpected resets during execution are properly handled.

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PR created automatically by Jules for task 14599056819608347885 started by @MrAbhi19

[google-labs-jules]

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