Based on telemetry, block MIG syscalls in the WebContent process sandbox on macOS.
<rdar://problem/117475500>
Pull request: https://github.com/WebKit/WebKit/pull/19539
Committed 269813@main (3a0472d22a28): <https://commits.webkit.org/269813@main> Reviewed commits have been landed. Closing PR #19539 and removing active labels.