Add an Approval entry in the Files left menu to display items pending for approval

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Feature request

Which Nextcloud Version are you currently using: (see administration page) Latest

Is your feature request related to a problem? Please describe.
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

I am frustrated when I closed an approval notification because I struggle in finding where is the document I have to approve.

Describe the solution you'd like
A clear and concise description of what you want to happen.

Having in the Files left menu an additional entry that would show up when I have files to approve would be a great solution. Several sub-entries could distinguish already approved files, the pending ones, etc...

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Use the dashboard widget, but this one has first to be enabled by the user, and one need to go back to the dashboard to see the files in pending approval status.

Additionaly, if the dashboard is disabled, the widget can't be used.

Additional context
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Start by locating the Files left menu and the existing approval dashboard widget in the JavaScript app. Trace how pending-approval files are identified and displayed, then define the menu entry and any sub-entries needed for pending or approved files. Done means users can find files awaiting approval from Files without returning to the dashboard.