Components: Rename `PolymorphicComponent` type to `WordPress Component`

[ciampo]

Required by #33960

Why

The PolymorphicComponent type name can be confusing (and refers to an implementation detail, components polymorphism). WordPressComponent is a better name.

What

We should refactor all of the references to PolymorphicComponent* types (defined in https://github.com/WordPress/gutenberg/blob/trunk/packages/components/src/ui/context/polymorphic-component.ts) and rename them to WordPressComponent*

A/C

• Rename all instances of PolymorphicComponent* types to WordPressComponent*
• Potentially add a changelog entry