[Free connectors] Create variant of status pill with "free" label

[ambirdsall]

Part of #21074. For users who are enrolled in the free connectors program, alpha and beta status pills should have an eye-catching "free" label inside (cf. figma, isolated component and in context); they look like this:

Since the variant means "free as in pizza" and billing is a cloud-specific concern, in a perfect world, this would be implemented as a new cloud-specific component wrapping the existing/general purpose "alpha"/"beta" status pills. But to do that, we'd either have to extract (and far worse, maintain) a nearly-identical-but-cloud-specific connections table or just flagrantly violate the "all cloud-specific components should only be referenced within src/packages/cloud/ API boundary; so let's not do that.

The new pill variant should also be added to the EnrollmentModal which currently has text placeholders Pill #1 and Pill #2: #21396