Truncate component relies on elementType instead of as (props API inconsistency)

[adamstankiewicz]

Improvements

Any component that allows consumers to override its underlying DOM element (e.g., div, span) should rely on an as prop for consistency with the majority of Paragon components (given most rely on react-bootstrap).

The Truncate component uses an elementType component instead of as. At least one engineer assumed as prop would work, and had to rely on the documentation to learner that Truncate uses elementType instead.

Given one of the goals of Paragon is to provide a reasonably consistent props API across components, we should ensure that any component that allows consumers to override its underlying DOM element relies on an as prop.

Tasks

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1. Deprecate the elementType prop (withDeprecatedProps) in Truncate component.
2. Introduce as prop instead to replace elementType (consistent with other components).
3. Identify any other Paragon components that support consumers overriding element types, ensuring they also use as instead of an inconsistent prop name.