Tracking: Block Visibility support follow up tasks

[t-hamano]

#71203 added new Block Visibility support.

This issue aims to further improve this for the WordPress 6.9 release.

Enhancements

These tasks should be addressed by the Beta 1 release, i.e., the Gutenberg 21.9 release.

• Allow synced patterns to be hidden (See Block API: Add block visibility control support and UI #71203 (comment)): Add blockVisibility support to Synced Pattern and Template Part #72026
• Show a snackbar when hiding a block from the block toolbar (See Block API: Add block visibility control support and UI #71203 (comment)): Block Visibility: show snackbar when hiding block #72027
• Core-63676: Avoid enqueueing scripts and styles for a block unless content is rendered wordpress-develop#9213

Below are some enhancements that I personally think would be "nice to have".

• Add a command to show or hide the selected block Block API: Add block visibility control in the command center #72154
• Add shortcut to show or hide the selected block Add keyboard shortcut toggle block visibility #72172

Code Quality

• Add e2e tests

This task can be addressed even in Beta1 and later.

[t-hamano]

@Mamaduka @talldan @ramonjd @tyxla @jasmussen If there are any other follow-up tasks that need to be done, feel free to update the list 🙏

[ramonjd]

Add a command to show or hide the selected block

@t-hamano is something like this what you had in mind?

• Block API: Add block visibility control in the command center #72154

Let me know if we're on the right track here. Thanks!