Fix hang when closing connections under load

[nvartolomei]

fix: Prevent hang when client disconnects under load

In Azurite, all operations are managed through concurrent operation
queues. A bug was identified where operations could hang indefinitely if
the client disconnected before the operation was processed.

This occurred because Azurite would attempt to attach event handlers to
the request's readable stream (body) after it had already been closed by
the client's disconnection. Since a closed stream emits no further
events (like 'data', 'close', or 'error'), the operation would never
complete, causing a permanent hang.

This fix addresses the issue by checking if the request stream is still
readable before attaching any event handlers. This ensures that we only
process requests that are still active, preventing the hang and allowing
the queues to continue processing other operations.

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• For Azurite V3, please send PR to main branch.
• For legacy Azurite V2, please send PR to legacy-dev branch.

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[blueww]

@nvartolomei
Thanks for the contribution!
It would be better if you could also add changelog.

@XiaoningLiu , @EmmaZhu,
Would you please help to review the PR?

[rockwotj]

@EmmaZhu would be great to merge this!