Display "free" status pills for Alpha/Beta connectors to users enrolled in the Free Connector Program

[ambirdsall]

Part of #21074.

As of #21564, ReleaseStageBadge accepts a prop to display a new "free" label, intended for alpha/beta connectors as viewed by a user who is enrolled in the Free Connector Program. For expediency, this PR stopped short of automatically enabling the free label within the badge component iteself (doing so broke some brittle unit test setup, which proved to be at least a medium-sized time sink); this also lets us choose when to display the free pills with a bit more granularity (i.e., e.g., we can choose to show them in page A, but not dropdown B).

Where to show free connectors (links are to Nico's Figma designs):

• credits page connection list, in the cell which shows the connection's constituent connectors
• connection page title
• source and destination pages
• check with Nico about whether to show the free pills in the source/destination dropdown: not included in designs, but perhaps the key place where users are presented status pills in the UI