Add new squish tests (or extend existing) for desktop-client

[gabi18]

Description

Follow up of #8651 which covers tests from patch release test plan, see #8651 (comment).

This issue is about adding tests (or extend tests) for test cases of the minor release test plan, see Regression_Test_Plan_Minor_Release.
Already existing tests: see https://github.com/owncloud/client/tree/master/test/gui.

To-Do:

1. Settings windows - Login

• 5 Introduce wrong credentials (extend tst_addAccount)
• ...

2. Folders

• 2 Create folder with long name
• 3 Create folder with special chars in name
• 6 Sync five subfolders
• 7 Sync five subfolders with files
• 9 Copy a folder
• 10 Create a subfolder with long name
• ...

...

[github-actions]

This issue was marked stale because it has been open for 30 days with no activity. Remove the stale label or comment or this will be closed in 7 days.

[github-actions]

The issue was marked as stale for 7 days and closed automatically.

Tracked in #8971