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Props talldanwp, gziolo.

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Co-authored-by: talldan <talldanwp@git.wordpress.org>
Co-authored-by: gziolo <gziolo@git.wordpress.org>

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Test this pull request with WordPress Playground.

@talldan, when you are done with all the backports, it would be great to add some basic PHPUnit tests covering how Pattern Overrides work with block bindings. It could be on the _block_bindings_pattern_overrides_get_value level to start with. However, more useful would be to have some integration test that runs do_blocks( '<!-- wp:block {"ref":18,"overrides":{"AcqHKe":{"text":[1,"Hello"]}}} /-->' ) (I had the old format in my local instance).

commit https://core.trac.wordpress.org/changeset/57585