The post categories block variation displays the parent block information

[carolinan]

Description

The post categories block still displays the block name and icon for the Post Hierarchical Terms Block in the settings sidebar, and there is no description.
This may be confusing for users since it does not match the block that they inserted.

When the Post Hierarchical Terms Block was created, there was a discussion about how to hide the parent block, but I don't believe it had a follow up?

We could change the title, add a description and update the icon to reflect the default variation, but I am not sure if that is the correct solution.

Step-by-step reproduction instructions

1. Enable a theme with support for full site editing
2. Add a post categories block
3. Notice the icon when inserting the block
4. In the block settings sidebar, notice the name of the selected block, the icon, and the missing description.

Expected behaviour

The information for the variation should be displayed.

Actual behaviour

The information for the "parent" block is displayed.

WordPress information

• WordPress version: 5.7-RC1-50437
• Gutenberg version: current master
• Are all plugins except Gutenberg deactivated? yes
• Are you using a default theme (e.g. Twenty Twenty-One)? TT1 Blocks

Device information

• Device: Desktop
• Operating system: Windows 10
• Browser: Chrome Version 88.0.4324.190