Fix canInsertBlockType selector returning true for blocks that don't allow inner blocks

[talldan]

Description

While working on #23952, I noticed canInsertBlockType will return true for block types that don't support inner blocks.

For example, running canInsertBlockType with core/paragraph as the first argument and the client id of another paragraph as the second argument returns true, indicating a paragraph can be nested under a paragraph.

I think this hasn't ever been a problem because this selector wouldn't have been used on a paragraph. It's perhaps only used within the InnerBlocks component.

For List View, the blocks in the list don't render InnerBlocks, so I needed to be able to determine if a block like a paragraph could support inner blocks outside of that context.

Code changes

When a block supports Inner Blocks, an object is added to blockListSettings for its clientId. This PR uses that implementation detail to determine if a blocks supports inner blocks. If that value is undefined, false is returned.

This meant updating a few tests that made the assumption no value would be stored in blockListSettings for a block that supports inner blocks.

How has this been tested?

1. Add a paragraph to a post
2. Grab the clientId by inspecting the HTML for the paragraph and copying the value for the data-block attribute.
3. In the console run the following, pasing the clientId copied in step 2 in place of _clientId_:

wp.data.select( 'core/block-editor').canInsertBlockType( 'core/paragraph', '_clientId_' );

e.g.:

wp.data.select( 'core/block-editor').canInsertBlockType( 'core/paragraph', 'c8fc7238-e82f-43f7-b79b-d45cbd56ec90' );

4. Observe that false is returned.
5. Insert some other blocks that support inner blocks (group, buttons, navigation).
6. Open the inserter for those blocks and observe the correct blocks are still displayed.

Types of changes

Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR.

[github-actions]

Size Change: +8 B (0%)

Total Size: 1.16 MB

Filename	Size	Change
build/block-editor/index.js	125 kB	+8 B (0%)

ℹ️ View Unchanged

Filename	Size	Change
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build/annotations/index.js	3.67 kB	0 B
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build/autop/index.js	2.82 kB	0 B
build/blob/index.js	620 B	0 B
build/block-directory/index.js	7.97 kB	0 B
build/block-directory/style-rtl.css	953 B	0 B
build/block-directory/style.css	952 B	0 B
build/block-editor/style-rtl.css	10.6 kB	0 B
build/block-editor/style.css	10.6 kB	0 B
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build/block-library/editor.css	8.36 kB	0 B
build/block-library/index.js	132 kB	0 B
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build/block-library/style.css	7.49 kB	0 B
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build/data/index.js	8.45 kB	0 B
build/date/index.js	5.38 kB	0 B
build/deprecated/index.js	772 B	0 B
build/dom-ready/index.js	568 B	0 B
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build/edit-navigation/style-rtl.css	1.08 kB	0 B
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build/edit-post/style.css	5.63 kB	0 B
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build/editor/style.css	3.79 kB	0 B
build/element/index.js	4.65 kB	0 B
build/escape-html/index.js	733 B	0 B
build/format-library/index.js	7.72 kB	0 B
build/format-library/style-rtl.css	547 B	0 B
build/format-library/style.css	548 B	0 B
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build/html-entities/index.js	621 B	0 B
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build/is-shallow-equal/index.js	711 B	0 B
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build/keycodes/index.js	1.94 kB	0 B
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build/list-reusable-blocks/style-rtl.css	476 B	0 B
build/list-reusable-blocks/style.css	476 B	0 B
build/media-utils/index.js	5.33 kB	0 B
build/notices/index.js	1.79 kB	0 B
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build/nux/style-rtl.css	671 B	0 B
build/nux/style.css	668 B	0 B
build/plugins/index.js	2.56 kB	0 B
build/primitives/index.js	1.41 kB	0 B
build/priority-queue/index.js	789 B	0 B
build/redux-routine/index.js	2.85 kB	0 B
build/rich-text/index.js	13.9 kB	0 B
build/server-side-render/index.js	2.71 kB	0 B
build/shortcode/index.js	1.7 kB	0 B
build/token-list/index.js	1.27 kB	0 B
build/url/index.js	4.06 kB	0 B
build/viewport/index.js	1.85 kB	0 B
build/warning/index.js	1.14 kB	0 B
build/wordcount/index.js	1.17 kB	0 B

_{compressed-size-action}

[youknowriad]

Makes sense to me.

[talldan]

Thanks for the quick review!