MSW for storybook with unified mock API ICSHWI-9377

This merge requests:

• adds storybook-addon-msw to handle using MSW (which we were already using for Jest) in Storybook.
• unifies the api mocking so that the same mocks can be used in Storybook, Cypress, and Jest.
  • mockAPI defines the mock endpoint functions
  • apiHandlers defines the url+method -> function mapping
  • Cypress and MSW use the same mapping to register HTTP intercepts
• connect MSW to mockAPI
• connect Cypress to mockAPI
• demos that Storybook scenarios for components which make API calls can be loaded into Cypress tests and everything still works (DeploymentDetailsContainer.spec.js)
• fixes the only E2E Cypress test we have to still work
• adds a command npm run startMock to start up the UI with MSW API mocks enabled (no backend)

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