Export resilient snack bar to use in podmail

[jesscmoore]

Description

Isolate the resilient snack bar as its own file, and export, to make available for use in podmail and other apps.

Why

So that as a developer I can use the resilient snack bar for snack bar responses to events in podmail app.

Closing Criteria

Checklist for closing the issue:

• No errors from make prep
• All tests pass make qtest
• exported resilient snack bar