* Unit tests for OC_Filechunking to verify the isComplete function
* Intergration tests to show that shuffling chunks is all fine

Returns -3 for unlimited quota in Webdav response.
Also adjusted personal page to show unlimited quota when set.

This adds the integration tests for the CSRF protection on the DAV backend introduced with 9.0.

Fixes https://github.com/owncloud/core/issues/22598

Recent refactorings have resulted in the header being added twice, this makes browsers ignore the header which removes any security gains.

This changeset adds the header only once and adds integration tests ensuring the correct header in future.

https://github.com/owncloud/core/issues/22577