Add syscall mig telemetry in the WebContent process on macOS to detect which are currently in use.
Pull request: https://github.com/WebKit/WebKit/pull/18042
Committed 268281@main (3e1f054f956f): <https://commits.webkit.org/268281@main> Reviewed commits have been landed. Closing PR #18042 and removing active labels.
<rdar://problem/115866683>