fix(pagination): render multistatus to XML before caching

[salmart-dev]

• Resolves: [Bug]: DAV missing collection type in paginated PROPFIND requests #53674

Summary

In PaginatePlugin, when using Redis, we are serializing objects coming from Sabre/Dav. This results in a loss of information that causes the bug.

Several approaches have been implemented and considered, but they have each different drawbacks:

• Custom serializer (Fix missing collection type in paginated requests #53725), resulted to be very complex and possibly hard to maintain.
• JsonSerializable: many files to adapt, especially in Sabre/Dav and its satellite projects, assumes that jsonSerialize won't be used for any other reason other than pagination for Nextcloud, since this requires serializing in a specific format.
• Pagination in Sabre/Dav: would be the cleanest and most efficient method, but unfortunately NC's code is very optimized to eager load collections, and not a collection of nodes. Implementing this, completely voids pre-loading (since we load N items per page) causing ~26x more queries.

TODO

• Test that usage with APCu is not impaired

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

[salmart-dev]

/backport to stable32

[salmart-dev]

/backport to stable31