Skip DataDirectoryProtected check if data directory is outside of webroot

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Is your feature request related to a problem? Please describe.
The check for the data directory protection is superfluous if the data directory resides outside of the webroot.

On some instances it also causes errors to be logged:
The requested uri(/var/my_datadir/.ocdata) cannot be processed by the script '/nextcloud/index.php'

Describe the solution you'd like
Check if the datadir is inside the webroot before performing the check - i.e. the head request in DataDirectoryProtected.

Describe alternatives you've considered

• Fix the setup so the request does not include /nextcloud in the script name. Working on that in parallel - but I think both fixes make sense.

Additional context
Errors only started appearing after data directory was moved out of webroot.

Start with the DataDirectoryProtected check and the head request described in the issue. Trace how the configured data directory is compared with the webroot before the check runs. Done means the check is skipped for data directories outside the webroot and the reported error is no longer logged in that setup.