Shared with me split

[kulmann]

Copied over from #5177 - needed to rebase and can't push to the origin of that PR.

Description

The "Shared with me" view shows 2 different lists for pending and accepted shares. On request user can see the declined files (clicking "show declined shares).

Motivation and Context

General UX improvement: Motivate the user to accept or decline the shares through better overview of the statuses and highlighted pending section.

How Has This Been Tested?

UI test scenario: Sharing multiple files through one testing account with another

• test case 1: pending shares, 3 or less pending shares --> simple list of pending shares
• test case 2: pending shares, more than 3 shares --> "show all", "show less" option
• test case 3: no pending shares--> no pending shares list shown
• test case 4: no accepted shares--> "You are currently not collaborating on other people's resources" message shown, "show declined shares" option appears at pending shares
• test case 5: accepted shares exist--> list with accepted shares and option to show declined shares appears
• test case 6: no declined shares--> "No declined files found" message appears
• test case 7 declined shares exist --> list with declined shares shown on click of "show declined shares"

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:

General view

[update-docs]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.

[ownclouders]

💥 Acceptance tests webUIOCISRename failed. The build is cancelled...

[kulmann]

Closing here, out of date. Needs new rebase of #5177