Change etag of folder when the quota of the folder changes

[camilasan]

the problem

Currently the client is only creating a PROPFIND request when the etag of folders/files changes. In that request we ask for the properties quota-bytes-available and quota-bytes-used. During the discovery of a new file to upload we try to warn the user of the quota usage when needed based on the quota-bytes-available we got during a PROPFIND.

If the user only got more space and did not touch the folder by deleting files to get more space, the client won't know that the quota changed.
The client will wrongly stop the user from uploading new files even when they have space left in storage because a new PROPFIND was not triggered and information stored in the client is outdated.

solution

Change the etag of folders when the quota changes to make sure the client can update the user of how much quota is left without delays.

@sorbaugh @come-nc @icewind1991 ^^

• fix(quota): throw error only for files that exceed the quota. desktop#8191
• Check for server quota before trying to upload files desktop#4580
• Error Handling on Server errors - limit retries desktop#6971

[come-nc]

Pointer for of a similar issue was solved for when groupfolders ACLs change: nextcloud/groupfolders@be14242
Basically we need to signal a change to the user home folder when its quota changes, and to a groupfolder root when its quota is changed as well.

[icewind1991]

The quota wrapper could maybe apply (xor the bytes or whatever) the quota with the etag (for folders). Though that might shut the door to possible future optimizations around etag