Replace axios-mock-adapter with Nock

[mnholtz]

Part of @fregante's implementation sketch here: https://github.com/pixiebrix/pixiebrix-extension/issues/4810#issuecomment-1999009685

[fregante]

We might use msw instead of nock when mocking our own API, we already use it in Storybook I think

• https://kentcdodds.com/blog/stop-mocking-fetch
• https://nate-d-gage.medium.com/mocking-axios-with-mock-service-worker-427b0f87aa08