Add entitlement for creating sandbox extensions to local files in the WebContent process. These extensions are being sent to the Network process to provide read access.
Pull request: https://github.com/WebKit/WebKit/pull/11443
Committed 261594@main (927c75f9049d): <https://commits.webkit.org/261594@main> Reviewed commits have been landed. Closing PR #11443 and removing active labels.
<rdar://problem/106668928>
Re-opened since this is blocked by bug 253931