Add specs for token expiration banner helper
requested to merge atevans-token-expiration-banner-specs into eduardosanz/token-expiration-banner-bring-backport-changes-to-master
What does this MR do and why?
Adds specs for token expiration banner helpers. Centralizes all app-wide checks (env var, version check, batched migration check) in a module owned by AuthN, per Imre's feedback.
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