message: Remove prepare-tests step from CONTRIBUTING.md
  With the revert of the webpack build PR we also need to revert the documentation change in CONTRIBUTING.md
diff: @@ -45,8 +45,7 @@ When submitting a PR, please fill out the template that is presented by GitHub w
  # Or run tests by selecting the appropriate drop down option
  # Alternatively, build and run tests through gulp and npm scripts
  - npx gulp build # build extension
  - npx gulp prepare-test # build sources and tests
  + npx gulp build # build
  npm test # test (must close all instances of VSCode)
  # Only available if Docker is installed and running
  