Enhancement: Error notifications include x-request-id

We've added a details box for the notifications, that pop up if an operation (e.g upload, download, add a share) fails.
This box contains the x-request-id and may help to debug the error on the server side.

https://github.com/owncloud/web/pull/9482
https://github.com/owncloud/web/pull/9474
https://github.com/owncloud/web/pull/9466
https://github.com/owncloud/web/pull/9448
https://github.com/owncloud/web/pull/9426
https://github.com/owncloud/web/issues/9449
