[Data Liberation] Recognize self-closing blocks in WP_Block_Markup_Processor #2120
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Adds a is_self_closing_block() method to WP_Block_Markup_Processor to enable detection and rewriting of block comments such as
<!-- wp:core/separator /-->
This will be needed in the markdown processor.
A part of #1894.
Testing instructions
CI. See the unit tests updated in this PR.