Handle storages not being available in webui and webdav

Adds `\OCP\Files\StorageNotAvailableException` which can be thrown by storage backends for when previously configured storage backends are (temporary) not available.

This exception is handled by both the web ui (show an error message) and WebDAV (throw a 503)

For #9088 

cc @PVince81 @DeepDiver1975 @schiesbn 
@PVince81 I think we can translate them unless we write them into the log file. I think this is a popup How can I produce this exception?