Add tests for dag filtering in home page and dag documentation modal

[tirkarthi]

This adds basic tests to ensure filter buttons in dags list page works. This also adds tests for dag documentation button and modal opening flow on click.

• Create a router that has all the routes configured to a memory router. https://api.reactrouter.com/v7/functions/react_router.createMemoryRouter.html
• Create a wrapper that uses the configured router and also accepts initialEntries to load the tests in a given URL location for assertion. There were some issues in using existing Wrapper.tsx with the changes in existing tests so created using AppWrapper.tsx with the changes to keep them separate.
• vitest recommends using msw for mocking requests. https://vitest.dev/guide/mocking#requests
• Handlers structured as per best practices to mock endpoints : https://mswjs.io/docs/best-practices/structuring-handlers
• On each test create a server with the handlers so that the test data is used.

[pierrejeambrun]

Looking nice.

Thanks for introducing the mock server.

Just a few nit/suggestions.

[pierrejeambrun]

Non blocking nit.

Looks good, thanks.

Branch needs rebasing.

[bbovenzi]

We can improve our Wrappers in another PR

[bbovenzi]

But it looks like we need a rebase

[tirkarthi]

Rebased against main which had changes to markdown rendering components.