ref(services): Make worker pool initialization threadsafe (#8053)
ref(services): Make worker pool initialization threadsafe (#8053)

This corrects an incorrect (and dumb, in retrospect) assuption I made
about how we run our processes in production.

Fixes SENTRY-6DP.
ifduyue/sentry,looker/sentry,ifduyue/sentry,looker/sentry,beeftornado/sentry,mvaled/sentry,beeftornado/sentry,ifduyue/sentry,ifduyue/sentry,mvaled/sentry,mvaled/sentry,looker/sentry,looker/sentry,looker/sentry,mvaled/sentry,mvaled/sentry,ifduyue/sentry,beeftornado/sentry,mvaled/sentry