[sharing-ng] possible to create links with expiration dates in the past

[individual-it]

Describe the bug

The expirationDateTime can be set to the past when creating a link

Steps to reproduce

1.send request to the createLink endpoint with
{"type":"view","expirationDateTime":"2023-12-04T00:00:00+00:00"}

Expected behavior

400 response with an error message as happens for the invite endpoint

Actual behavior

{"expirationDateTime":"2023-12-04T00:00:00Z","id":"eaaIVySoBAKjDPd","link":{"@libre.graph.displayName":"","@libre.graph.quickLink":false,"preventsDownload":false,"type":"view","webUrl":"https://ocis.owncloud.test/s/xoAIjqalGuNLTQS"}}

[individual-it]

linked to #6993

[micbar]

Should be fixed now. Can you test again?

[individual-it]

I've unskipped a test in the ocis-php-sdk that tries this and it works owncloud/ocis-php-sdk#126