Better emphasise pending removals in What's New

[erlend-aasland]

As per discussion on Discourse.

Suggesting to add a Pending Removal category in What's New, to better communicate this information to users.

[ezio-melotti]

I merged the PR for the beta, however I'm reopening this since there were ongoing discussions and we want to go through more iterations before the final release.

[erlend-aasland]

Thanks, Ezio!

[vstinner]

For 3.12, see: #92562