GH-6448 Migrate edit_command.jsx to be pure and use Redux (#6858)

* Migrate edit_command.jsx to be pure and use Redux, add basic test

* Update newCommand to reference modified command

* Fix typo

* Remove unnecessary re-renders

webapp/tests/components/integrations/edit_command.test.jsx

@@ -0,0 +1,36 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+import React from 'react';
+import {shallow} from 'enzyme';
+
+import EditCommand from 'components/integrations/components/edit_command/edit_command.jsx';
+
+describe('components/integrations/EditCommand', () => {
+    test('should match snapshot', () => {
+        const emptyFunction = jest.fn();
+        const id = 'r5tpgt4iepf45jt768jz84djic';
+        global.window.mm_config = {};
+        global.window.mm_config.EnableCommands = 'true';
+
+        const wrapper = shallow(
+            <EditCommand
+                team={{
+                    id,
+                    name: 'test'
+                }}
+                commandId={id}
+                commands={[]}
+                editCommandRequest={{
+                    status: 'not_started',
+                    error: null
+                }}
+                actions={{
+                    getCustomTeamCommands: emptyFunction,
+                    editCommand: emptyFunction
+                }}
+            />
+        );
+        expect(wrapper).toMatchSnapshot();
+    });
+});