chore: (eslint) restrict imports of @material-ui Link

BREAKING CHANGE: Added a new ESLint rule that restricts imports of Link from @material-ui

Signed-off-by: Dmitry Lobanov <lobanov.dmitry.s@gmail.com>

.changeset/great-colts-invite.md

@@ -0,0 +1,16 @@
+---
+'@backstage/cli': minor
+---
+
+Added a new ESLint rule that restricts imports of Link from @material-ui
+
+The rule can be can be overridden in the following way:
+
+```diff
+module.exports = require('@backstage/cli/config/eslint-factory')(__dirname, {
++  restrictedImports: [
++    { name: '@material-ui/core', importNames: [] },
++    { name: '@material-ui/core/Link', importNames: [] },
++  ],
+});
+```