Product Collection: announcement post about coming out of beta

[kmanijak]

Issue Description:
We removed PC beta label in #47572. This issue is about working on the followup to Announcing the Product Collection Block post in Developer Blog.

Ref: pdzGYk-1uB-p2#comment-1719

Goal:
The Announcement Post is published.

[kmanijak]

There's Product Collection Blocks — The next iteration in WooCommerce 9.0 Release Post.