Add more tests for desktop-client

[swoichha]

Description

Currently we have tests for adding new account, syncing, and sharing. There are still more tests that can be added. Some of them are mentioned below.

To-Do:

• Login/Logout users (@swoichha )
• Remove user(@swoichha )
• Share files/folder with group(@Talank )
• Edit shared file/folder(rename received share item name/change content) (@swoichha )
• Edit share permissions(@swoichha)
• As a collaborator, share to a group to whom the file is already shared by author (@Talank )

[swoichha]

CC: @michaelstingl @TheOneRing

[swoichha]

Regression Testplan

FROM: https://github.com/owncloud/QA/blob/master/Desktop/Regression_Test_Plan_Patch_Release.md

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• Visually check all tabs
  • Tabs look correct
• Sync a file to the server
  • File has been synced
• Check the overlay icons
  • Overlay icons are present
• Share a file with another user on the same server
  • File has been shared successfully
• Create a public link
  • Public link has been created and can be opened in a browser
• disable / re-enable VFS
  • VFS has been disabled / enabled

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