Adds logic that fixes the limitation for souces by allowing merging the `uses_context` defined by block bindings sources into supported block types. Each source defines the context it needs and it is added to the block types that are using the block bindings API.
Fixes#60525.
Props santosguillamot, gziolo, czapla, thekt12.
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It fixes the coding style issues reported. It goes further and improves the code quality it other places where the logic for block bindings was added.
Follow-up for [57514].
Props: gziolo, mukesh27, youknowriad, santosguillamot.
See #60282.
Built from https://develop.svn.wordpress.org/trunk@57526
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