Add ESLint Rule to firehydrant Plugin

Signed-off-by: AmbrishRamachandiran <ambrish.r@infosys.com>

.changeset/nasty-radios-cheat.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-firehydrant': patch
+---
+
+Added ESLint rule `no-top-level-material-ui-4-imports` in the `firehydrant` plugin to migrate the Material UI imports.

plugins/firehydrant/.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/firehydrant/src/components/ServiceDetailsCard/ServiceDetailsCard.tsx

@@ -16,12 +16,10 @@
 import React, { useEffect, useState } from 'react';
 import { DateTime } from 'luxon';
 import { ServiceAnalytics } from '../ServiceAnalytics/ServiceAnalytics';
-import {
-  Box,
-  Button as MaterialButton,
-  Typography,
-  makeStyles,
-} from '@material-ui/core';
+import Box from '@material-ui/core/Box';
+import MaterialButton from '@material-ui/core/MaterialButton';
+import Typography from '@material-ui/core/Typography';
+import { makeStyles } from '@material-ui/core/styles';
 import ExitToAppIcon from '@material-ui/icons/ExitToApp';
 import NotesIcon from '@material-ui/icons/Notes';
 import WhatshotIcon from '@material-ui/icons/Whatshot';