src: skip inspector wait in internal workers
Internal workers are essential to load user scripts and bootstrapped
with internal entrypoints. They should not be waiting for inspectors
even when --inspect-brk and --inspect-wait were specified, and avoid
blocking main thread to bootstrap.
IsolateData can be created with a specified PerIsolateOptions instead of creating a copy from the per_process namespace. This also avoids creating a copy bypassing the parent env's modified options, like creating a worker thread from a worker thread.