Add UIFeature to hide public space and room creation (#30708)

* Add settings to hide public room & space creation.

* Add space changes.

* Add room changes.

* lint

* Add playwright tests

* don't specialcase 1 join rule

* Ensure mocks get cleared

* Fixup test

* Add SpaceCreateMenu component unit-tests

* Fixup create room test asserts

* fix import

playwright/e2e/room/create-room.spec.ts

@@ -7,6 +7,7 @@ Please see LICENSE files in the repository root for full details.
 */
 
 import { SettingLevel } from "../../../src/settings/SettingLevel";
+import { UIFeature } from "../../../src/settings/UIFeature";
 import { test, expect } from "../../element-web-test";
 
 const name = "Test room";
@@ -65,4 +66,33 @@ test.describe("Create Room", () => {
         const header = page.locator(".mx_RoomHeader");
         await expect(header).toContainText(name);
     });
+
+    test.describe("Should hide public room option if not allowed", () => {
+        test.use({
+            config: {
+                setting_defaults: {
+                    [UIFeature.AllowCreatingPublicRooms]: false,
+                },
+            },
+        });
+
+        test("should disallow creating public rooms", { tag: "@screenshot" }, async ({ page, user, app, axe }) => {
+            const dialog = await app.openCreateRoomDialog();
+            // Fill name & topic
+            await dialog.getByRole("textbox", { name: "Name" }).fill(name);
+            await dialog.getByRole("textbox", { name: "Topic" }).fill(topic);
+
+            axe.disableRules("color-contrast"); // XXX: Inheriting colour contrast issues from room view.
+            await expect(axe).toHaveNoViolations();
+            // Snapshot it
+            await expect(dialog).toMatchScreenshot("create-room-no-public.png");
+
+            // Submit
+            await dialog.getByRole("button", { name: "Create room" }).click();
+
+            await expect(page).toHaveURL(new RegExp(`/#/room/!.+`));
+            const header = page.locator(".mx_RoomHeader");
+            await expect(header).toContainText(name);
+        });
+    });
 });