Fix: Abort fetch requests on timeout in SimStudioClien

[SyedaAnshrahGillani]

Summary

This PR addresses a critical resource management and performance issue in the SimStudioClient by implementing proper request abortion for timed-out fetch calls.

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Problem

Previously, the executeWorkflow method used Promise.race to handle timeouts. While this approach rejected the timeout promise, the underlying fetch request continued running in the background, leading to:

• Resource Leaks: Network connections remained open, increasing memory consumption.
• Performance Degradation: Continued background activity added unnecessary load.
• Unpredictable Behavior: Late server responses to already timed-out requests could lead to inconsistent client state.

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Solution

The method is refactored to use the AbortController API for more robust timeout handling:

• A new AbortController is created for each fetch request.
• A setTimeout is used to trigger abortController.abort() after the configured timeout period.
• The controller’s signal is passed to the fetch options to enable cancellation.
• clearTimeout is called once the request completes, preventing stale timeouts.
• Error handling is enhanced to catch AbortError and provide clear messaging for timeout events.

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Benefits

• ✅ Improved Resource Management — Cleans up network and memory resources on timeout.
• ✅ Enhanced Performance — Prevents wasteful processing by halting stalled requests.
• ✅ Predictable Behavior — Ensures client-side state remains consistent by terminating timed-out calls.
• ✅ Best Practice Compliance — Aligns with modern JavaScript standards for request cancellation.

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