Fix logging in after logging out + other navigation to main page

[helenxuyang]

Summary

Trello task: Logging in doesn't work after logging out

Original issue: logging in after logging out would sign in correctly using Google, but would not navigate to the home page.

Root cause: the sign out button needs to navigate to Logic, not Login. Logic contains a Login as well as the home/onboarding widgets, and listens for changes to the authentication provider, which is what allows logging into navigate to the home/onboarding page.

Follow ups:

• Refactored classes in main_common to clean up first time login logic because it was kind of a mess
  • Renamed Logic to Main (for clarity)
  • Combined HomeOrOnBoarding class into Main (for simplification)
  • Changed Main into stateless widget that uses a FutureBuilder for checking first time login instead of super stateful widget with super sus 3 sec timer
• Added asyncs and awaits in Profile, Login, and AuthProvider (for safety with asynchronous code)
• Changed sign out button's navigation to use pushAndRemoveUntil so that it removes all pages and pushes a Main (fixes issue where you can't log in after logging out)
• Changed ride confirmation button's navigation to use popUntil with the first route instead of a named route
• Changed all navigation to named '/' route to go until first route (fixes issue where you navigate to a black screen)

Test Plan

Test each of the following with both a new user and a returning user (to make sure navigating back to the homepage/login is correct even with onboarding)

• Log out and in (should navigate back to login page, then to home page)
• Finish requesting ride (should navigate back to home page)
• Finish cancelling a ride (should navigate back to home page)
• Cancel in middle of creating ride (should navigate back to home page)

Log in and log out (as new and returning user)

1. New user login -> confirm we see onboarding
2. Log out -> confirm navigate to login page
3. Log in -> confirm navigate to home page
4. Returning user login -> confirm navigate to home page
5. Log out -> confirm navigate to login page
6. Log in -> confirm navigate to home page

Record_2022-11-15-20-39-39.mp4

Finish requesting ride

1. New user login -> confirm we see onboarding
2. Request a ride -> confirm navigates back to home page
3. Log out -> confirm navigates back to login page
4. Returning user login -> confirm navigate to home page
5. Request a ride -> confirm navigates back to home page
6. Log out -> confirm navigates back to login page

Record_2022-11-15-20-43-04.mp4

Finish cancelling ride

1. New user login -> confirm we see onboarding
2. Cancel a ride -> confirm navigates back to home page
3. Returning user login -> confirm navigate to home page
4. Cancel a ride -> confirm navigates back to home page

Record_2022-11-16-19-45-31.mp4

Cancel in middle of requesting ride

1. New user login -> confirm we see onboarding
2. Start requesting a ride but cancel out of it -> confirm navigates back to home page
3. Returning user login -> confirm navigate to home page
4. Start requesting a ride but cancel out of it -> confirm navigates back to home page

Record_2022-11-16-19-50-48.mp4

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Notes

[dti-github-bot]

[diff-counting] Significant lines: 92.