Remove potential mismatching dav session data during login #35318
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This PR will make sure that whenever a session is being reused during login we properly clean up the dav session data which is only required to prioritise basic auth over the session login on WebDAV. (ref owncloud/core#13245)
We can safely reset this if the session id is being regenerated during login.
The issue never occurred in the wild as far as I can see but was just a side effect of the cypress tests in viewer that reused the cookie jar that was used for userA webdav requests to run a login and e2e test for userB.
See #34934 (comment) for more technical insights.