Upgrade to Nextcloud 34

Front-end changes

OC.Dialogs.fileexists was deprecated and is now removed. Use the conflict picker from the @nextcloud/dialogs library instead.
OC.Notifications was deprecated and is now removed. Use the notification API from the @nextcloud/dialogs library instead.
OC.Apps was deprecated and is now removed. Use Vue components from the @nextcloud/vue instead.
OC.*menu* methods were deprecated and are now removed. Use Vue components from the @nextcloud/vue instead.
Magic handling of .live-relative-timestamp (elements with this class were automatically updated to show relative timestamps) was removed. Use the NcDateTime component from the @nextcloud/vue library instead
The global snapper was deprecated and is now removed. For the app navigation please migrate your app to Vue and use the NcAppNavigation component from the @nextcloud/vue library instead.
Some deprecated globally shared libraries were removed. If you still rely on them, you need to bundle them with your app:
- jQuery was deprecated and scheduled for removal since Nextcloud 19.
- jQuery UI was deprecated and scheduled for removal since Nextcloud 19.
- Backbone was deprecated and scheduled for removal since Nextcloud 19.
- OC.Files.Client as it was extending the Backbone.

\OCP\DB\QueryBuilder\ITypedQueryBuilder is added in favour of \OCP\DB\QueryBuilder\IQueryBuilder and can be accessed through \OCP\IDBConnection::getTypedQueryBuilder. This query builder has the benefit of accurately returning the selected columns in a query result, increasing type safety.
\OCP\Talk\IConversationOptions has been extended, to allow defining the newly created conversation as related to a meeting with it’s start and end date. The information is used by Talk to automatically clean up such conversations after a given time.

\OCP\Notification\INotification::setIcon, \OCP\Notification\INotification::setLink and \OCP\Notification\IAction::setLink now throw \OCP\Notification\InvalidValueException when the provided link is not absolute as previously announced in Upgrade to Nextcloud 30

\OCP\Share_Backend, \OCP\Share_Backend_Collection, \OCP\Share_Backend_File_Dependent were removed. This old share backend was replaced in Nextcloud 9 with a new backend system based on IShareProvider.