This PR makes the following changes:

• The execution-controller Client now creates an abortController. Every call to Client.sendSliceComplete() now includes a reference to abortController.signal allowing for the pEvent in the messenger Core.onceWithTimeout() to be aborted.
• A new listener is added for the server:shutdown event that calls abortController.abort(). This prevents a worker from still waiting for a response to sendSliceComplete() after the server is shutdown.
• bump teraslice-messaging from 1.7.0 to 1.7.1

ref: #2106