Remove triggerupdate.php & add quiet option for CLI scanner

@DeepDiver1975 @PVince81 @icewind1991 I was digging through the file scan stuff and stumbled over triggerupdate.php, only later saw the junior jobs.

triggerupdate actually checks hasUpdated() before making the scan, so there is a difference in behavior between triggerupdate and `occ files:scan --path="foo/bar"`.

Anyway, leaving this here until someone decides what to do with it
As I mentioned before this gives issues when using external storages, the path needs to be made relative to the storage before being passed to the scanner using `$mount->getInternalPath()`

Note that that method requires an absolute path with as of writing this `$dir` is not