Migrate legacy classes to the v4 alternative#14643
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We were passing through the extension, but weren't using it.
RobinMalfait
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with the `in`, we go up the prototype chain. Which means that this
happens:
```js
let utility = 'constructor'
utility in LEGACY_CLASS_MAP // true
LEGACY_CLASS_MAP[utility].toString() // function Object() { [native code] }
```
We will register empty utilities for the old legacy classes, this way we can rely on the design system and the real parser to get an Candidate AST out of the rawCandidate.
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This PR adds a mapping from legacy classes to new classes. For example, the
flex-shrink-0is still used in our projects, but is deprecated in v3.The migration does a tiny bit of parsing because we can't rely on
designSystem.parseCandidate(…)because this requires the utility to be defined which is not the case for legacy classes.This migration runs after the migration where we handle prefixes, so we don't have to worry about that. We do have to worry about the
!location, because theimportantmigration also relies on thedesignSystem.overflow-cliptext-clipoverflow-ellipsistext-ellipsisflex-grow-0grow-0flex-shrink-0shrink-0decoration-clonebox-decoration-clonedecoration-slicebox-decoration-slice