Fix linter and flow errors [ci e2e]

frontend/src/metabase/__support__/integrated_tests_mocks.js

-import React from 'react'
-
 global.ga = () => {}
 global.ace.define = () => {}
 global.ace.require = () => {}

frontend/src/metabase/query_builder/components/dataref/SegmentPane.integ.spec.js

@@ -15,7 +15,6 @@ import { delay } from "metabase/lib/promise"
 import QueryBuilder from "metabase/query_builder/containers/QueryBuilder";
 import DataReference from "metabase/query_builder/components/dataref/DataReference";
 import { orders_past_30_days_segment } from "metabase/__support__/sample_dataset_fixture";
-import { createSegment, deleteSegment } from "metabase/admin/datamodel/datamodel";
 import { FETCH_TABLE_METADATA } from "metabase/redux/metadata";
 import QueryDefinition from "metabase/query_builder/components/dataref/QueryDefinition";
 import QueryButton from "metabase/components/QueryButton";

frontend/src/metabase/reference/selectors.js

@@ -16,7 +16,7 @@ import {
 
 import {
     getShallowDatabases as getDatabases, getShallowTables as getTables, getShallowFields as getFields,
-    getShallowMetrics as getMetrics, getShallowSegments as getSegments, getMetadata
+    getShallowMetrics as getMetrics, getShallowSegments as getSegments
 } from "metabase/selectors/metadata";
 export { getShallowDatabases as getDatabases, getShallowTables as getTables, getShallowFields as getFields, getShallowMetrics as getMetrics, getShallowSegments as getSegments } from "metabase/selectors/metadata";