Snippet: How to register a block variation but hide it from the inserter

[bph]

Discussed in #348

^{Originally posted by ryanwelcher November 26, 2024}
In the #outreach channel, I had a discussion with someone that wanted to create a block variation but only have it be inserted via a pattern.

This is possible by using the scope property and settings it to `block'

[ryanwelcher]

Snippet is ready for first review - https://docs.google.com/document/d/1-wem7ORmODPoUDImJRn7BYiCOA29hZJWHvWv1ch90pk/edit?usp=sharing

[ndiego]

Completed the first review!

[justintadlock]

Looks good to go.