This commit simplifies block style variation class name generation to ensure unique class names by replacing the hashing of block attributes in the block style variation class names with a call to `wp_unique_id`.
Doing so avoids potential for non-unique class names and conflicting styles when exact copies of a block are inserted via a repeated pattern.
Props aaronrobertshaw, martinkrcho, mukesh27, peterwilsoncc, ramonopoly.
Fixes#61877.
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