remove unused imports

Author: lipalath-ms

UI/web-app/src/components/HRQuerySource/HRQuerySource.base.tsx

@@ -1,8 +1,8 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT license.
 
-import React, { useCallback, useEffect, useRef, useState } from 'react';
-import { classNamesFunction, Stack, type IProcessedStyleSet, IStackTokens, Label, IconButton, TooltipHost, ChoiceGroup, IChoiceGroupOption, SpinButton, NormalPeoplePicker, DirectionalHint, IDropdownOption, ActionButton, DetailsList, DetailsListLayoutMode, Dropdown, Selection, IColumn, ComboBox, IComboBoxOption, IComboBox, IDragDropEvents, mergeStyles } from '@fluentui/react';
+import React, { useEffect, useRef, useState } from 'react';
+import { classNamesFunction, Stack, type IProcessedStyleSet, IStackTokens, Label, IconButton, TooltipHost, ChoiceGroup, IChoiceGroupOption, SpinButton, NormalPeoplePicker, DirectionalHint, IDropdownOption, ActionButton, DetailsList, DetailsListLayoutMode, Dropdown, Selection, IColumn, ComboBox, IComboBoxOption, IComboBox, IDragDropEvents } from '@fluentui/react';
 import { useTheme } from '@fluentui/react/lib/Theme';
 import { TextField } from '@fluentui/react/lib/TextField';
 import { IPersonaProps } from '@fluentui/react/lib/Persona';