complete_oauth_flow is called twice for google ads

[sherifnada]

Tell us about the problem you're trying to solve

We seem to be making two calls to complete_oauth_flow once we receive an auth code from google, which makes the UI not show any visual success clues.

The issue is demonstrated in this video: https://www.loom.com/share/6da17af4728c49258871f925c70c5aa1

It's worth noting that creating the source works (the refresh token seems to be retained correctly) but

Describe the solution you’d like

we should make only one API call, and show a visual cue that it succeeded.

[sherifnada]

assigning to @jrhizor for triage

[sherifnada]

also confirmed this happening for salesforce

[tuliren]

This is also happening for Github:

[tuliren]

@ChristopheDuong, FYI the frontend is fixed now. We need to deploy cloud to pick up this change.