Remove blocks that are not useful within Layout Builder

I've added some very basic test coverage. It seems possible that there might be some changes in the future that would cause these tests to fail. "Help" and "Messages" and "Tabs" are very basic link labels that might appear somewhere in the UI, for example.

Thanks for working on this!

Seems there is 1 failure that could be legit to the change.

I updated BlockFilterTest to account for the reduced number of filter results.

Tests look good.

Question for committer will a change record be needed?

Probably doesn't need a CR because I don't think there's any action site maintainers need to take on this.

Committed 3fe287d and pushed to 11.x. Thanks!

lauriii → closed merge request !4144

Automatically closed - issue fixed for 2 weeks with no activity.