a11y: add aria-live="polite" to results table in folder content

[giuliaghisini]

The results of folder content, updates without any warning to the user.
Evaluate aria live polite on the updated results to improve accessibility.

[Hrittik20]

Hello @giuliaghisini, will adding aria-live="polite" to Contents.jsx be sufficient or should I also add it to TabularView.jsx for the table?

[giuliaghisini]

Hello @giuliaghisini, will adding aria-live="polite" to Contents.jsx be sufficient or should I also add it to TabularView.jsx for the table?

for this specific case it's sufficient to add it in Contents.jsx.
I don't know if TabularView.jsx will be used to display results from search and it's content changes applying some filters..
maybe it will be ok to add it too.

I ask you, if you could make also another pull-request for volto 17 for this fix. Thanks!