* [Functional Tests] Use @kbn/test on Kibana CI (#18967)
* Replace test:api with @kbn/test runTests
* Improve CLI help menu 🆘
* Use --es-from
* Replace jenkins:selenium with kbn-test
* Validate cli args, fixing test in the process
* Clean up some stuff
* Code review fixes
* Explanation for collectCliArgs
* Remove exit codes, they're useless anyway.
* Make markdown vis test pass with dev_mode setting
* Tests
* Remove unneeded export
* Code review: move console logging up to cli.js
* Code review: refactor startServers and runTests to take single options collection
* Code review: Remove all things I am sure we do not use
* Improve tests
* Code review fixes
* Pass created log to runFtr, runElasticsearch, runKibanaServer
* Update --es-from option to --esFrom
* Let dev server run from snapshot by default
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