Remove use of TimeoutAbortController

[achingbrain]

We use timeout-abort-controller to have auto-aborting AbortSignals after a set timeout.

AbortSignal has a static .timeout method that does the same thing and doesn't cause the node event loop to wait for the timeout, so we no longer need to call .clear on the controller as we do with timeout-abort-controller.

It's supported in all recent browsers and node 17+.

We should remove our usage of timeout-abort-controller and replace it with AbortSignal.timeout.