Add Tooltips and aria-labels to list views

[Elblinator]

resolves #6370

[Elblinator]

Given my comment in the issue:

files (restriction, public file)

As far as I understand the guideline for aria labels:
Aria labels should only be added if it's a clickable event which is not explained by the content inside
given that a public file is a) not a clickable evene and b) has already a tooltip I did not add anything for it

I am not positive that the aria-label in the participant-list with the delegatioons is redundant given the same tooltip

[bspekker]

With the changes my screen reader only reads out the icons but not the entries. For example it now says only "Visibility" where it previously said only "internal".

Instead both aspects should be read out leading to "visibility internal"