Loading Sentry via --require causes debugger to cycle

[timfish]

Using the --require flag to load Sentry causes the node debugging inspector to initialize every second for the local variables integration.

Reported by @s1gr1d

[timfish]

This is caused by the fact that --require and --import inject the code into EVERY child thread and process. This includes:

• The main thread (obviously!)
• All worker_threads
• Processes created with child_process.fork()
• Processes created by the cluster module

This means the SDK is injected and started in the worker threads and it then starts more worker threads!