[Sharing NG] Replace dav property public-link-permission with type

[JammingBen]

Describe the bug

When doing a PROPFIND on a public space, the response contains a dav property public-link-permission to indicate the permissions for this link. However, these permissions are being represented via permission bits, which is the old (deprecated) way of the OCS API.

Web needs this information to distinguish between the link types view and uploadOnly, since these can't be distinguished solely by the webdav permissions.

Steps to reproduce

1. Create a public link for a folder
2. Do a PROPFIND to list the resources for this folder (e.g. https://host.docker.internal:9200/remote.php/dav/public-files/CIlnOrnDLxMmPHx)
3. Check the server response for the first resource (= the share itself)

Expected behavior

There is a dav property that represents the link's type, since that's the graph property representing the permissions.

Actual behavior

The is a dav property public-link-permission.

cc @rhafer

[2403905]

@JammingBen What format do you expect for the public-link-permission?

[JammingBen]

@2403905

public-link-permission is the actual behaviour. The new property should reflect the link's type, so I'd name it public-link-type. It should be a simple string representing the type, e.g. view.