Show Google Ads extractor in UI
- [x] Enable Google Ads OAuth: https://gitlab.com/meltano/infrastructure/-/issues/21
- [x] Update documentation
- [x] Make explicit that Google Ads extractor does not pull in data on Smart Campaigns: https://gitlab.com/meltano/meltano/-/issues/1918
- [x] Enable Google Ads extractor in discovery.yml
- [x] Set Adwords User Agent to default value and hide from UI: https://gitlab.com/meltano/meltano/-/issues/1908
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