Add test verifying directories enumerated as files is server bug

[claucambra]

From my notes on the issue:

• Checking into bug where on second page of paginated enumeration, folders are identified as files
  • It's a server bug.

<d:multistatus
    xmlns:d="DAV:"
    xmlns:s="http://sabredav.org/ns"
    xmlns:oc="http://owncloud.org/ns"
    xmlns:nc="http://nextcloud.org/ns">
    <d:response>
        <d:href>/remote.php/dav/files/admin/</d:href>
        <d:propstat>
            <d:prop>
                <d:displayname>admin</d:displayname>
                <d:resourcetype>
                    <d:collection/>
                </d:resourcetype>
            </d:prop>
            <d:status>HTTP/1.1 200 OK</d:status>
        </d:propstat>
    </d:response>
    <d:response>
        <d:href>/remote.php/dav/files/admin/Media/</d:href>
        <d:propstat>
            <d:prop>
                <d:displayname>Media</d:displayname>
                <d:resourcetype>
                    <d:collection/>
                </d:resourcetype>
            </d:prop>
            <d:status>HTTP/1.1 200 OK</d:status>
        </d:propstat>
    </d:response>
</d:multistatus>


<d:multistatus
    xmlns:d="DAV:"
    xmlns:s="http://sabredav.org/ns"
    xmlns:oc="http://owncloud.org/ns"
    xmlns:nc="http://nextcloud.org/ns">
    <d:response>
        <d:href>/remote.php/dav/files/admin/Nextcloud_Server_Administration_Manual.pdf</d:href>
        <d:propstat>
            <d:prop>
                <d:displayname>Nextcloud_Server_Administration_Manual.pdf</d:displayname>
                <d:resourcetype/>
            </d:prop>
            <d:status>HTTP/1.1 200 OK</d:status>
        </d:propstat>
    </d:response>
    <d:response>
        <d:href>/remote.php/dav/files/admin/Templates/</d:href>
        <d:propstat>
            <d:prop>
                <d:displayname>Templates</d:displayname>
                <d:resourcetype/>
            </d:prop>
            <d:status>HTTP/1.1 200 OK</d:status>
        </d:propstat>
    </d:response>
</d:multistatus>

• First block is page 0, second block is page 1
  • The templates item is a folder. No resourcetype info on it.
  • NextcloudKit only sets the directory property on an NKFile to true if this property is present and matching collection for the resourcetype (like in the first block)
• Started work on checking for working set changes in RemoteChangeObserver

curl calls:

curl -X PROPFIND -H "Depth: 1" -H "X-NC-Paginate: true" -H "X-NC-Paginate-Count: 2" -u "admin:admin" -i --data '<?xml version="1.0"?>
<d:propfind xmlns:d="DAV:">
  <d:prop>
    <d:displayname /><d:resourcetype />
  </d:prop>
</d:propfind>' "nextcloud.local/remote.php/dav/files/admin/"

curl -X PROPFIND -H "Depth: 1" -H "X-NC-Paginate: true" -H "X-NC-Paginate-Count: 2"  -u "admin:admin" -i --data '<?xml version="1.0"?>
<d:propfind xmlns:d="DAV:">
  <d:prop>
    <d:displayname /><d:resourcetype />
  </d:prop>
</d:propfind>' "nextcloud.local/remote.php/dav/files/admin/"

[Copilot]

Pull Request Overview

This PR adds a new test to verify that directories are correctly recognized in a paginated file enumeration, addressing a server bug where folders are misclassified as files.

• Adds a new boolean flag on test items (using i % 5 == 0) to indicate directories
• Introduces assertions to confirm the correct count and ordering of folder-type items