[contract testing] [share ng] Extend propfind contract testing

[amrita-shrestha]

Describe the bug

While adding tests related to share-ng, found that ocis-tests miss some contract testing as mentioned below.
Scenario: remove share link and propfind resource to see if the response contain or not

<oc:share-types>
<oc:share-type>3</oc:share-type>
</oc:share-types>
<oc:privatelink>
https://localhost:9200/f/a3be74ba-6183-4942-9458-440b92c5895b$68962830-8cbb-4226-b3b4-458c50793487%210e590fe7-8816-4d75-bd42-5ffa2fa81410
</oc:privatelink>

Scenario: user Alice shared resource with user Brian, Brian is deleted , user Alice propfind the shared resource to check if the response contains shares details or not after share deleted

Question

• Should we add such scenario to apiContract->propfind.feature ❓

cc @ScharfViktor @saw-jan @phil-davis