Similar to https://github.com/discourse/discourse-chat/pull/1283, this adds the <audio> inline player for uploaded audio files in chat channels.
1. `test()` and `render()` instead of `componentTest()` 2. Angle brackets 3. `strictEqual()`/`true()`/`false()` assertions This removes all remaining uses of `componentTest` from core
discourse-chat
As part of this move, we are also renaming `discourse-chat` to `chat`.
