* Update tests to use fs.promises when not top-level
* Move two to asyncFilter
* Update site-data-references.js
* Update site-data-references.js
* Clear out await fs.exists
* Lint
* A few more fixes
* Can't use async when defining tests
* remove FEATURE_NEW_VERSIONS from feature-flags.json
* remove process.env.FEATURE_NEW_VERSIONS from include files
* remove process.env.FEATURE_NEW_VERSIONS from lib files
* remove process.env.FEATURE_NEW_VERSIONS from middleware files
* remove process.env.FEATURE_NEW_VERSIONS from script files
* remove process.env.FEATURE_NEW_VERSIONS from test files
* update test fixtures to use new versions as canonical fixtures