Testcase: versions (+ trashbin)

[PVince81]

Multiple cases to test:

1. Reverting versions
2. Downloading versions

Combine this with:

1. Delete file that has versions, restore it
2. Delete versioned shared file as owner, restore it as owner
3. Delete versioned shared file as recipient, restore it as owner
4. Delete versioned shared file as recipient, restore it as recipient

And the same with and without encryption. There were cases where encryption keys for versions were not moved/restored properly from trashbin

[PVince81]

Note: we're still missing OCS APIs for trashbin and versions:

• versions: Public API to retrieve/manage versions core#10571
• trashbin: Public API to work with trashbin core#15646