Present changes in catalog to the user

[timroes]

When a user uses the "Refresh catalogue" functionality on an existing saved connection, we want to show a modal containing the changes in the catalog that the user need to confirm.

The backend API for this is tracked in #13232

Figma mocks:https://www.figma.com/proto/liLQhcbpVHiEDW18kiXQe3/01_03_CONNECTIONS?scaling=min-zoom&page-id=1%3A3&node-id=198%3A3822&starting-point-node-id=112%3A320
^ updated figma link 6/22

The behavior should be as follows:

• The user presses the refresh button, which would do a request towards the web_backend/connections/get endpoint, which will return the diff format outlined in the BE issue
• If there is a diff available, the FE will show a modal with just a confirm dialog as shown in the designs. The confirm button will only hide the modal. There is no further BE calls happening.
• The modal currently showing the saving the connection should no longer be shown.
• Should still send the full catalog to the backend

[octavia-squidington-iii]

cc @airbytehq/frontend

[teallarson]

Bug discovered while working on this: we should improve error handling if the schema refresh fails
#14096