What?

This PR removes an obsolete hook: useResolvedBlockStyleVariationsConfig

Why?

With the recent shift from styles.blocks.variations to styles.variations in #62712, the useResolvedBlockStyleVariationsConfig no longer had an effect and isn't required for a couple of reasons:

• Block style variations defined within theme style variations must now be registered directly by the theme i.e. they are no longer automatically registered.
• The theme.json class now unwraps or resolves the shared variation definitions on instantiation so by the time the user config is retrieved here the work this hook did has already been done.

How?

• Remove useResolvedBlockStyleVariationsConfig

Testing Instructions

1. Setup a theme to register a block style variation via either a theme.json partial or using register_block_style (example partial snippet below)
2. Redefine the shared block style variation in a theme style variation via styles.variations
3. In the site editor apply the variation to a block and ensure the partial's styles apply
4. Confirm switching to the theme style variation applies its customized block style variation styles
5. Tweak the block style variation via Styles > Blocks > Block Type > Variation
6. Create a post in the post editor applying the same block style variation to a block, confirming the correct styles
7. Make sure the site editor and post editor applied variations are reflected correctly on the frontend