My personal workflow is to develop against the www-modern release
channel, with the variant flags enabled, because it encompasses the
largest set of features. Then I rely on CI to run the tests against
all the other configurations.
So in practice, I almost always run
```
yarn test -r=www-modern --variant TEST_FILE
```
instead of
```
yarn test TEST_FILE
```
So, I've updated the `yarn test` command to use those options
by default.
* Deprecate old test script commands
* Update PR template test script
* Add test-stable and test-www-classic
* Update circle test names
* Rename test-www-classic to test-classic
* Missed some job renames
* Missed some more job renames
* Add new test cli
* Remove --variant accidentally added to test-persist
* s/test/tests
* Updates from review
* Update package.json tests
* Missed a release channel in circle.yaml
* Update config.yml to use just run: with test commands
* Update release-channel options and add build dir checks
* Update test args to use the new release-channel options
* Fix error in circle config.yml
* Fix a wrong condition for the --variant check
* Fix a wrong condition for the --persistent check
* Prettier
* Require build check for devtool tests as well
