fix(country-map): move Iran ISO code fix into the GeoJSON generator notebook

The Iran province ISO 3166-2 corrections (Alborz -> IR-30, Razavi
Khorasan -> IR-09) were only applied to the checked-in iran.geojson,
so the next `npm run update-maps` run would have silently reverted
them. Add an Iran section to the notebook, mirroring how other
countries needing manual corrections (Norway, Ukraine, France, etc.)
are patched, and regenerate iran.geojson from it to confirm the fix
now survives regeneration.

superset-frontend/plugins/legacy-plugin-chart-country-map/test/countries/iran.test.ts

@@ -0,0 +1,59 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 fs from 'fs';
+import path from 'path';
+
+// The geojson is loaded via fs rather than a normal import because the
+// webpack/jest loaders treat *.geojson as an opaque asset (a URL string in
+// the browser build, an empty mock object under jest), so neither exposes
+// the actual feature data to a unit test.
+const iranGeojsonPath = path.join(
+  __dirname,
+  '..',
+  '..',
+  'src',
+  'countries',
+  'iran.geojson',
+);
+
+type IranFeature = {
+  properties: { ISO: string; NAME_1: string };
+};
+
+const getIranFeatures = (): IranFeature[] =>
+  JSON.parse(fs.readFileSync(iranGeojsonPath, 'utf-8')).features;
+
+test('every province in the Iran map has a unique ISO code', () => {
+  const isoCodes = getIranFeatures().map(feature => feature.properties.ISO);
+  const uniqueIsoCodes = new Set(isoCodes);
+  expect(uniqueIsoCodes.size).toBe(isoCodes.length);
+});
+
+test('Tehran, Alborz and Razavi Khorasan have their correct, distinct ISO codes', () => {
+  const provincesByIso = Object.fromEntries(
+    getIranFeatures().map(feature => [
+      feature.properties.NAME_1,
+      feature.properties.ISO,
+    ]),
+  );
+
+  expect(provincesByIso.Tehran).toBe('IR-07');
+  expect(provincesByIso.Alborz).toBe('IR-30');
+  expect(provincesByIso['Razavi Khorasan']).toBe('IR-09');
+});