[tests-only] Add scenarios demonstrating access directly to the Shares folder

[phil-davis]

Description

The related issue discusses how OCIS behaves when a user tries to write directly to the Shares folder (where received shares are seen). ownCloud10 allows the user to write "ordinary files and folders" to the "Shares" folder. Those end up in the "Shares" folder along with received shares.

We don't currently have scenarios that explicitly demonstrate this behavior of ownCloud10. This PR adds a short set of scenarios demonstrating how the "feature" behaves.

It is tagged notToImplementOnOCIS because we know that OCIS behaves differently (and will probably continue to be different) - the "Shares" folder is more like a "jail for shares", and the share receiver can't pollute it with their own random files and folders. We can add some tests to OCIS to demonstrate the OCIS behavior.

Related Issue

owncloud/ocis#2319

How Has This Been Tested?

CI

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Database schema changes (next release will require increase of minor version instead of patch)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:
• Changelog item, see TEMPLATE

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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