Clean up our tests in preparation for the testing sprint (#2466)

* Fix coverage reporting

Codecov hasn't been working recently because Vitest doesn't report coverage by default.

* Suppress some noisy log lines

Closes https://github.com/element-hq/element-call/issues/686

* Store test files alongside source files

This way we benefit from not having to maintain the same directory structure twice, and our linters etc. will actually lint test files by default.

* Stop using Vitest globals

Vitest provides globals primarily to make the transition from Jest more smooth. But importing its functions explicitly is considered a better pattern, and we have so few tests right now that it's trivial to migrate them all.

* Remove Storybook directory

We no longer use Storybook.

* Configure Codecov

Add a coverage gate for all new changes and disable its comments.

* upgrade vitest

---------

Co-authored-by: Timo <toger5@hotmail.de>

src/utils/media.ts

@@ -0,0 +1,32 @@
+/*
+Copyright 2022 New Vector Ltd
+
+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.
+*/
+
+/**
+ * Finds a media device with label matching 'deviceName'
+ * @param deviceName The label of the device to look for
+ * @param devices The list of devices to search
+ * @returns A matching media device or undefined if no matching device was found
+ */
+export async function findDeviceByName(
+  deviceName: string,
+  kind: MediaDeviceKind,
+  devices: MediaDeviceInfo[],
+): Promise<string | undefined> {
+  const deviceInfo = devices.find(
+    (d) => d.kind === kind && d.label === deviceName,
+  );
+  return deviceInfo?.deviceId;
+}