In [54358], styling for Button blocks that had been removed from classic themes was reintroduced. However, it was added with a global scope, whereas editor styles are usually added with a `.editor-styles-wrapper` selector, which makes them more specific.
This change modifies the way that classic theme styles are added so that they also get wrapped in an `.editor-styles-wrapper` selector to match specificity.
Furthermore, adjust specificity for some Button block related styling in the editor for the Twenty Twelve and Twenty Twenty themes.
Merges [https://github.com/WordPress/gutenberg/pull/44731 Gutenberg PR 44731] into trunk.
Follow-up to [54358].
Props scruffian, cbravobernal, sabernhardt, audrasjb.
See #56467.
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