[Security Solution] - Rename esql setting (elastic#182432)

## Summary

Follow up to this PR: elastic#181616
Renaming `discover:enableEsql` to `enableESQL` according to this change:
elastic#182074

x-pack/plugins/security_solution/public/common/hooks/esql/use_esql_availability.ts

@@ -6,12 +6,18 @@
  */
 
 import { useMemo } from 'react';
+import { ENABLE_ESQL } from '@kbn/esql-utils';
 import { useKibana } from '../../lib/kibana';
 import { useIsExperimentalFeatureEnabled } from '../use_experimental_features';
 
+/**
+ * This hook combines the checks for esql availability within the security solution
+ * If the advanced setting is disabled, ESQL will not be accessible in the UI for any new timeline or new rule creation workflows
+ * The feature flags are still available to provide users an escape hatch in case of any esql related performance issues
+ */
 export const useEsqlAvailability = () => {
   const { uiSettings } = useKibana().services;
-  const isEsqlAdvancedSettingEnabled = uiSettings?.get('discover:enableESQL');
+  const isEsqlAdvancedSettingEnabled = uiSettings?.get(ENABLE_ESQL);
   const isEsqlRuleTypeEnabled =
     !useIsExperimentalFeatureEnabled('esqlRulesDisabled') && isEsqlAdvancedSettingEnabled;
   const isESQLTabInTimelineEnabled =