fix(files): reuse available data for folder tree

[susnux]

• Requires (based on): chore(deps): update @nextcloud/files to v4.0.0-rc.1 #58108
• for Tree view improvements #58099

Summary

This delays the folder tree generation until the files list was initially loaded,
this allows us to reuse the fetched data for the currently open folder.
Meaning we already know which folders are available under the current folder.

Moreover we also can generate the folder tree to the root (without siblings) which leads to faster initial load.
The other siblings are loaded when the tree was initialized and they are requested by the user.

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)

[susnux]

/backport to stable33

[artonge]

I was able to test:

1. When loading from a subfolder, then there is no way to navigate the siblings, up to the root folder. There might not be an easy fix for that one. And I don't think this is new, so you can ignore.
2. When loading from the root folder, it does depth 2 requests on all the folders of the root folder. We should do no request, until the tree view is open, and then only one depth 2 on the root folder when the tree view gets opened.
3. Also, the views still seems to be registered, even though they are not visible