housekeeping: use jest to run webpack bundle tests (via #1438)

* use jest for webpack tests

* update lockfile

* uninstall @kyleshockey/mocha-webpack

* add `test-webpack` to test matchers

* fix test-webpack `testMatch`

* move webpack tests into main test folder/command

* remove obsolete `test:webpack` invocation

* fix linter

Author: shockey

.gitignore

@@ -20,6 +20,7 @@ notes/
 .DS_Store
 .deps_check
 test/specmap/data/private
+test/webpack-bundle/.tmp
 browser
 
 # Automated releases