Select: Portal menu by default (#48176)

* Remove menuShouldPortal from all <Select /> components

* fix unit tests

* leave menuShouldPortal as an escape hatch

* Fix import order

public/app/features/live/pages/RuleSettingsArray.tsx

@@ -39,7 +39,6 @@ export const RuleSettingsArray: React.FC<Props> = ({ onChange, value, ruleType,
     <>
       <Select
         placeholder="Select an index"
-        menuShouldPortal={true}
         options={indexArr}
         value={index}
         onChange={(index) => {

public/app/features/live/pages/RuleSettingsEditor.tsx

@@ -15,7 +15,6 @@ export const RuleSettingsEditor: React.FC<Props> = ({ onChange, value, ruleType,
   return (
     <>
       <Select
-        menuShouldPortal={true}
         key={ruleType}
         options={entitiesInfo[ruleType]}
         placeholder="Select an option"