🏗 Fix forbidden describe pattern on tests (#33545)
🏗 Fix forbidden describe pattern on tests (#33545)

https://github.com/ampproject/amphtml/pull/33544#discussion_r604380220

The older pattern `^describe[\.|\(|$]` would not match deliberate (`$`) cases where `describe` would be followed by a newline and a method:

```js
describe
  .configure()
  ...
```
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