fix(metrics): do not report metrics from worker threads #517
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When instrumented via NODE_OPTIONS="--require ..." (which is inherited by
worker threads), each worker thread will announce independently and act like
the main thread. This can cause issues, in particular if the worker thread is
started from a dependency in node_ module and it identifies a different
package.json as its main package.json, hence reporting a different application
name etc.
To prevent this, we disable sending metrics and snapshot data from
worker threads for now.
fixes #500
refs 88823