8a7c18c12a
## Description This fixes the API doc generation that I broke when I moved the snippets tool into the framework. It removes the last of the template support (properly this time), and makes sure all of the tests pass. ## Related Issues - https://github.com/flutter/flutter/issues/144408 - https://github.com/flutter/flutter/issues/147609 - https://github.com/flutter/flutter/pull/147645 ## Tests - Fixed tests, including smoke test of doc generation.