fix(storage): fix test_mrd_concurrent_download_cancellation

[nidhiii-27]

The test test_mrd_concurrent_download_cancellation is failing specifically because the download was successful before the test could cancel it.

• Increased object_size from 5MB to 20MB and adjusted num_chunks to 40 (resulting in 500KB per chunk).

Error:

             for i in range(num_chunks):
Step #3 - "run-tests-and-delete-vm":                 if i % 2 == 0:
Step #3 - "run-tests-and-delete-vm": >                   assert isinstance(results[i], asyncio.CancelledError)
Step #3 - "run-tests-and-delete-vm": E                   AssertionError: assert False
Step #3 - "run-tests-and-delete-vm": E                    +  where False = isinstance(None, <class 'asyncio.exceptions.CancelledError'>)
Step #3 - "run-tests-and-delete-vm": E                    +    where <class 'asyncio.exceptions.CancelledError'> = asyncio.CancelledError
Step #3 - "run-tests-and-delete-vm": 
Step #3 - "run-tests-and-delete-vm": tests/system/test_zonal.py:904: AssertionError

[gemini-code-assist]

Code Review

This pull request updates the test_mrd_concurrent_download_cancellation system test by increasing the test object size to 20MB and reducing the number of chunks to 40. It also modifies the asyncio.sleep duration to 0 to yield control to the event loop immediately before canceling tasks. I have no feedback to provide as there are no review comments.