remove React's FC type from codebase (#3527)

* WIP-packages: remove React's FC type from codebase

* remove FC from other directories

* fix build failures

* add types to required packages

plugins/newrelic/src/components/NewRelicComponent/NewRelicComponent.tsx

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import React, { FC } from 'react';
+import React from 'react';
 import { Grid } from '@material-ui/core';
 import {
   Header,
@@ -26,7 +26,7 @@ import {
 } from '@backstage/core';
 import NewRelicFetchComponent from '../NewRelicFetchComponent';
 
-const NewRelicComponent: FC<{}> = () => (
+const NewRelicComponent = () => (
   <Page themeId="tool">
     <Header title="New Relic">
       <HeaderLabel label="Owner" value="Engineering" />

plugins/newrelic/src/components/NewRelicFetchComponent/NewRelicFetchComponent.tsx

@@ -14,15 +14,13 @@
  * limitations under the License.
  */
 
-import React, { FC } from 'react';
+import React from 'react';
 import { Progress, Table, TableColumn, useApi } from '@backstage/core';
 import Alert from '@material-ui/lab/Alert';
 import { useAsync } from 'react-use';
 import { newRelicApiRef, NewRelicApplications } from '../../api';
 
-export const NewRelicAPMTable: FC<NewRelicApplications> = ({
-  applications,
-}) => {
+export const NewRelicAPMTable = ({ applications }: NewRelicApplications) => {
   const columns: TableColumn[] = [
     { title: 'Application', field: 'name' },
     { title: 'Response Time', field: 'responseTime' },
@@ -61,7 +59,7 @@ export const NewRelicAPMTable: FC<NewRelicApplications> = ({
   );
 };
 
-const NewRelicFetchComponent: FC<{}> = () => {
+const NewRelicFetchComponent = () => {
   const api = useApi(newRelicApiRef);
 
   const { value, loading, error } = useAsync(async () => {