Fix linting and TypeScript issues, update test utils and instructions-route test

[neubig]

This PR fixes linting and TypeScript issues, updates test utils, and improves the instructions-route test. It includes the following changes:

• Updated test utils to include AuthProvider, UserPrefsProvider, and QueryClientProvider
• Fixed TypeScript errors in the instructions-route test
• Replaced jest.mock with vi.mock in the instructions-route test
• General code cleanup and formatting

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To run this PR locally, use the following command:

docker run -it --rm   -p 3000:3000   -v /var/run/docker.sock:/var/run/docker.sock   --add-host host.docker.internal:host-gateway   -e SANDBOX_RUNTIME_CONTAINER_IMAGE=docker.all-hands.dev/all-hands-ai/runtime:c9fe12e-nikolaik   --name openhands-app-c9fe12e   docker.all-hands.dev/all-hands-ai/openhands:c9fe12e