Migrate more jest tests to vitest (#33898)

* Migrate more jest tests to vitest

* Fix jest config

* Fix jest config

* Make remaining jest tests type-happy

apps/web/test/setup/adapter.ts

@@ -0,0 +1,25 @@
+/*
+Copyright 2026 Element Creations Ltd.
+
+SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE files in the repository root for full details.
+*/
+
+import { vi } from "vitest";
+import { mocked as jestMocked } from "jest-mock";
+
+const isJest = typeof jest !== "undefined";
+
+/**
+ * Subset of the vitest API surface, with jest equivalents for the same functions when running under jest.
+ */
+const adapter = {
+    fn: isJest ? (jest.fn as unknown as typeof vi.fn) : vi.fn,
+    spyOn: isJest ? (jest.spyOn as unknown as typeof vi.spyOn) : vi.spyOn,
+    mocked: isJest ? (jestMocked as typeof vi.mocked) : vi.mocked,
+} as Pick<typeof vi, "fn" | "spyOn" | "mocked">;
+
+const mocked = adapter.mocked;
+export { adapter as vi, mocked };
+
+export { type Mocked, type MockedObject } from "vitest";