Embed block: Inline preview is enabled for Pinterest URLs and is not properly rendered

[fluiddot]

Describe the bug
Pinterest provider is not supported in the Embed block so the inline preview shouldn't be enabled, however, since it's being rendered as a WordPress embed it's not being filtered out and therefore it's being displayed.

Related code:
https://github.com/WordPress/gutenberg/blob/aa6217fc2a81bdc71c2d545744b9735c7626385a/packages/block-library/src/embed/edit.native.js#L218-L219

Besides, it's not properly rendered, on iOS the preview is empty and on Android, the content is cut off.

To Reproduce

1. Add an Embed block.
2. Use a Pinterest URL (example: https://www.pinterest.com/annsawesomepins/).
3. Observe that on iOS the inline preview is not displayed and on Android, the preview is cut off.

Expected behavior
The inline preview should be displayed properly or disabled until it's supported.

Screenshots

iOS	Android

Smartphone (please complete the following information):

• Device: iPhone 12 Pro Max, Samsung Galaxy S20 FE 5G
• OS: iOS 14.5, Android 10
• Version 18.3

Additional context
Looks like the Pinterest provider has been added recently as per this commit from WordPress repo.

[fluiddot]

For now the inline preview will be disabled after merging this PR: #3991