Eslint - require copyright header rule (#8514)

* bump eslint plugin to 0.5.2

Signed-off-by: Kerry Archibald <kerrya@element.io>

* add rule

Signed-off-by: Kerry Archibald <kerrya@element.io>

* add missing copyright headers

Signed-off-by: Kerry Archibald <kerrya@element.io>

* fix comment order

Signed-off-by: Kerry Archibald <kerrya@element.io>

test/components/views/typography/Heading-test.tsx

@@ -1,3 +1,19 @@
+/*
+Copyright 2022 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
 import React from 'react';
 import { renderIntoDocument } from 'react-dom/test-utils';