Crash telemetry indicates that soft-linking of the Data Detection frameworks fails on some devices, perhaps when the screen is locked. Since this eager-linking was meant to improve performance, and we can re-soft-link later if the initial attempt fails, we should try and fail gracefully if the directory is not accessible.

This should not introduce any change in behavior, as cases that used to work should continue. It should simply reduce the changes of a failure terminating a web process prematurely.