Add quick configure buttons to more external services
Created by: beyang
This covers all the actions in this doc (except syncing GitLab group projects, which requires a larger backend change): https://docs.google.com/document/d/1bX5GkOdkKb19-Mg96G93WfyIghZILAvuMxcIbM-VOls/edit
Test plan:
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Go through every external service (http://localhost:3080/site-admin/external-services/new) and click every button under "Quick configure"
Before merge:
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Update changelog
Post-merge:
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Follow up on remaining items in https://docs.google.com/document/d/1bX5GkOdkKb19-Mg96G93WfyIghZILAvuMxcIbM-VOls/edit