[Cocoa] Stop creating a broken symlink for com.apple.WebKit.WebAuthn.xpc
<rdar://problem/112025024>
Pull request: https://github.com/WebKit/WebKit/pull/15699
Committed 265912@main (8b1a13b39bba): <https://commits.webkit.org/265912@main> Reviewed commits have been landed. Closing PR #15699 and removing active labels.