Right now the functional tests are run against a distributable of Kibana in CI, but that distributable is running with `--env.name=development`. That causes the optimizer to run again before the tests can start and prevents the functional tests from running against the actual version of the application users will end up getting. This seems necessary for some tests, but not all of them, but I would like to get all of the tests running against the production version of Kibana soon.
This PR implements a second ftr config, `test/functional_production` that uses basically a copy of the `test/functional` config but with a few minor adjustments, removing the `--env.name=development` kbnServerArg and using a unique junit report name. To accomplish this I needed to modify the `@kbn/test` module to only pass the `--dev` flag to the Kibana server if it is being run in development mode, which it currently does by testing the args for `--env.name=development` or two args next to each other: `'--env.name'` and `'development'`. It does this by converting the `extraKbnOpts` option into an `addExtraKbnArgs` function, which is called with the final args just before passing them to the proc runner and given a chance to modify then after all other args are resolved (pulling from different places in config based on the build type, etc.)
Over the next couple weeks I'll push up PRs for individual test suites, migrating them over to the new production config, hopefully in a short period of time we will have all the function test suites back under that `test/function` config and can run them all against the Kibana server in production mode.