chore: added eslint rule for gocd plugin

Signed-off-by: Gaurav Pandey <grvpandey11@gmail.com>

.changeset/unlucky-clouds-wash.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-gocd': patch
+---
+
+Added an optional ESLint rule - no-top-level-material-ui-4-imports -in gocd plugin which has an auto fix function to migrate the imports and used it to migrate the Material UI imports for plugins/gocd.

plugins/gocd/.eslintrc.js

@@ -1 +1,5 @@
-module.exports = require('@backstage/cli/config/eslint-factory')(__dirname);
+module.exports = require('@backstage/cli/config/eslint-factory')(__dirname, {
+    rules: {
+      '@backstage/no-top-level-material-ui-4-imports': 'error',
+    },
+  });

plugins/gocd/src/components/GoCdBuildsInsights/GoCdBuildsInsights.tsx

@@ -21,14 +21,12 @@ import {
   toBuildResultStatus,
   GoCdBuildResultStatus,
 } from '../../api/gocdApi.model';
-import {
-  Box,
-  Grid,
-  Card,
-  CardContent,
-  Tooltip,
-  Typography,
-} from '@material-ui/core';
+import Box from '@material-ui/core/Box';
+import Grid from '@material-ui/core/Grid';
+import Card from '@material-ui/core/Card';
+import CardContent from '@material-ui/core/CardContent';
+import Tooltip from '@material-ui/core/Tooltip';
+import Typography from '@material-ui/core/Typography';
 import { DateTime, Duration } from 'luxon';
 
 export type GoCdBuildsInsightsProps = {

plugins/gocd/src/components/GoCdBuildsTable/GoCdBuildsTable.tsx

@@ -16,8 +16,8 @@
 import React, { useState } from 'react';
 import { Entity, getEntitySourceLocation } from '@backstage/catalog-model';
 import { useEntity } from '@backstage/plugin-catalog-react';
-import { Alert } from '@material-ui/lab';
-import { Button } from '@material-ui/core';
+import Alert from '@material-ui/lab/Alert';
+import Button from '@material-ui/core/Button';
 import GitHubIcon from '@material-ui/icons/GitHub';
 import {
   GoCdBuildResult,