testing for vue & migrate periods.spec.js (#18092)
* initial periods service conversion
* get period service migration to compile
* getLastNRange was public static
* fix an issue, switch angularjs tests to use chrome headless and hope it works
* remove phantomjs requirement
* get vue unit testing to work w/ jest (only option right now, the mocha plugin is not compatible w/ vue 3 and no one is working on making it compatible)
* more test code
* progress
* more progress
* more progress, single passing test
* finish converting periods.spec.js and get test to pass
* remove use of any in periods service and rebuilt corehome
* add missing file headers
* fix run-once.sh
* debug travis build
* remove debugging code & update submodule
* update submodule
* more travis debugging
* install npm dependencies in "install-ubuntu.sh"
* use latest node
* try this again
* typos
* more debugging
* more debugging
* testing something
* testing something else
* testing something else
* testing something else
* testing something else
* testing something else
* testing something else
* testing something else
* testing something else
* testing something else
* testing something else
* revert travis.yml changes
* update some expected screenshots
* releasechecklisttest fix
