Twenty Twenty-One: Add blockType suggestions to block patterns

[ryelle]

When using a given block, patterns can be suggested which use that block. For example, in Twenty Twenty-One, the "Large Text" pattern uses a heading block, so if the user adds a heading block, it should suggest this pattern.

See ​Contextual patterns for easier creation for more details.

The patterns in Twenty Twenty-One should be updated to have these suggestions.

[ryelle]

Columns block & suggestions

[ryelle]

This adds the following suggestions:

• Heading: Large Text
• Cover: Links area
• Columns: Overlapping images, Overlapping images and text, Contact information

[poena]

This is a small change that will help users find and select patterns, it would be good to add it to the next theme release or 6.1, which ever is first.

Trac ticket: https://core.trac.wordpress.org/ticket/53647

This fixes a coding standard issue on previous patch.

[audrasjb]

Tests are passing, let's ship this patch :)

[audrasjb]

In 53716:

Twenty Twenty-One: Add block type suggestions to block patterns.

When using a given block, patterns which use that block can be suggested. This changeset adds blockType suggestion for several Twenty Twenty-One bundled patterns.

Props ryelle, poena, audrasjb.
Fixes #53647.

Committed in https://core.trac.wordpress.org/changeset/53716