Print blocks-based element CSS classes only when a block theme is used #37631
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Submission Review Guidelines:
Changes proposed in this Pull Request:
This PR aims to remove blocks-based CSS classes from elements when the current theme is not an FSE theme. This should minimize the footprint of FSE-related changes for legacy themes.
Hint for the reviewer: There is also a risk involved in this PR. Please check the issue description for details.
Closes #37630
How to test the changes in this Pull Request:
Using the WooCommerce Testing Instructions Guide, include your detailed testing instructions:
wp-element-buttonclass is only added in the FSE theme.