support linting through package.json files, instead of `CLIEngine.baseConfig`, adding package.json files when needed, https://github.com/phetsims/tasks/issues/972
support linting through package.json files, instead of `CLIEngine.baseConfig`, adding package.json files when needed, https://github.com/phetsims/tasks/issues/972

phetsims/vegas,phetsims/vegas,phetsims/vegas