Integration fix docs

Add internal locking plugin

clarify log level setting design, fix #20514

Use proper variable

`$shares` is not defined. Introduced with https://github.com/owncloud/core/commit/c3e7d324c5e61eb087fb2ea5102d332f9f08db3d and thus also in stable8.2

Fix getOwner for external shares

Update .well-known redirects to the new dav endpoint

This reverts commit 68321efd.

This reverts commit d831c255.

Introducing CalDAV into core

Add internal fileid to webdav response

Handle errors on memcached level

Introduce a new property "oc:fileid" to return the internal file id.

This is because the original "oc:id" property is a compound and it is
not possible to extract the real id without knowing the instance id. The
instance id is not available to external clients.

Try to fix logging errors we did observe on ci ....

Allow storage wrappers to through a forbidden exception with retry information for clients

[provisioning api] Return empty list if group does not have subadmins

Notification - Add tests for the "return $this" and fix it on the new method

Expose share owner id and display name via files webdav

Move index.php from files to AppFramework

Notification api update

Instead of throwing an error just return an empty list. Since that is
actually what it is.

Fixes #19789

1. Allows it to use the more secure CSP rules of the AppFramework.
2. Adds some unit tests.