* Fix RuleEditor flaky test for existing grafana managed alert
* Fix RuleEditor flaky test for creating a new grafana managed alert
* Fix tests for cloud rules
* Split tests for different rule types
* Move common clickSelectOption method to helpers
* Remove from RuleEditorCloudRules.test.tsx a repeated cloud rule test
* Move existing grafana rule test case to a new file
* Split RuleEditorCloudRules test: move checking only allowed data sources test case to a new test file
* Re-use common ui const
* Re-use renderRuleEditor method
* Create getDiscoverFeaturesMock to reduce code
* refactor(selectoptiontest): move helper function out of grafana/ui so testing-lib isn't in bundle
* test(selectoptionintest): update import location of helper function
* test(amroutes): put back missing selectOptionInTest helper
* test(selectoptionintest): clean up remaining file imports / exports
* test(queryeditor): fix failing import
* refactor(grafana-ui): reuse selectOptionInTest in SelectBase test