Add auto-suggested featured image back

[kean]

Description

Partially reverts https://github.com/wordpress-mobile/WordPressKit-iOS/pull/825/files without losing the existing data – the actual featured image.

ℹ Please replace the above with a link to the issue this pull request addresses, as well as a summary of the implementation details.

WordPressKit.zip

Testing Details

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[dangermattic]

	1 Warning
⚠️	Package.swift was changed without updating its corresponding Package.resolved. Please resolve the Swift packages in Xcode.

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