test: async iife in repl
Context
Fixes: #38685
The previous PR has more than ten months, it's why I decided to jump on it.
Improvements
A regression test ensures that async IFEE will work on the REPL.
cc @addaleax
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Fixes: #38685
The previous PR has more than ten months, it's why I decided to jump on it.
A regression test ensures that async IFEE will work on the REPL.
cc @addaleax