#1611 Add http_proxy to client & Fix deviceflow Pull request opened by ByronHsu TL;DR 1. Add http_proxy to oauth2 client because in on-prem cluster use cases, the client might not have access to the external network 2. Remove

verification_url_complete

because that field not exists in azure ad and the oauth2 standard. 3. Concat the scopes by white space per the documentation Type ☑︎ Bug Fix ☑︎ Feature ☐ Plugin Are all requirements met? ☑︎ Code completed ☐ Smoke tested ☑︎ Unit tests added ☐ Code documentation added ☐ Any pending items have an associated Issue Tracking Issue flyteorg/flyte#3620 flyteorg/flytekit ✅ All checks have passed 30/30 successful checks