Need ResponseAsBool Spector scenario

There is a decorator https://github.com/Azure/typespec-azure/blob/main/packages/typespec-client-generator-core/lib/decorators.tsp#L680 for response as bool. We should also have a Spector scenario for this.

Start with the response-as-bool decorator in packages/typespec-client-generator-core/lib/decorators.tsp around line 680, then inspect existing Spector scenarios to find the appropriate pattern and location. Add coverage for this decorator and verify that the Spector scenario exercises the response-as-bool behavior successfully.

Written by the indexing model from the issue text.