Preview cards should not render Warnings or other interactive UIs that are not a preview

[afercia]

Description

Reported by @t-hamano on #67433 (comment)

The editor uses 'preview cards' in a few places. For example the list of Patterns 9In the inserter and other places) shows a 'card' with the pattern preview.

These previews are the actual rendering of the patterns. As such, they also render warnings and potentially other UIs that aren't really part of the preview.

For example, when a Pattern contains a block with invalid markup, it makes perfectly sense to show the Warning in the editing view. Screenshot:

However, it doesn't make any sense showing the Warning in the card preview. Screenshot:

Such a warning rendered there is hardly usable and I guess it also breaks the accessibility and semantics of the preview card.

Step-by-step reproduction instructions

• Go to the Site editor > Patterns > and edit one of your custom patterns under 'My patterns'.
• Switch the editor to the 'code' view and alter the markup to intentionally make one of the pattern's block invalid.
• Switch the editor back to the 'visual' view.
• Observe the editor renders the Block contains unexpected or invalid content. warning.
• Click 'Open naavigation' at the toop left of the screen and go to 'My patterns'.
• Observe the pattern card preview renders the Warning in the preview.

Screenshots, screen recording, code snippet

No response

Environment info

No response

Please confirm that you have searched existing issues in the repo.

• Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

• Yes

Please confirm which theme type you used for testing.

• Block
• Classic
• Hybrid (e.g. classic with theme.json)
• Not sure