[compute_ctl] Add timeout for tracing_utils::shutdown_tracing()
#3982
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Describe your changes
Shutting down OTEL tracing provider may hang for quite some time, see, for example:
Yet, we want computes to shut down fast enough, as we may need a new one for the same timeline ASAP. So wait no longer than 2s for the shutdown to complete, then just error out and exit the main thread.
Issue ticket number and link
Related to neondatabase/cloud#3707
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