Fix the settings.prompt.login update hook

Philip Frillingrequested to merge
issue/openid_connect-3577049:3577049-combine-update-proposals-3.x into 3.x

Closes #3577049

Merging !184 (closed) and !186 (closed).

  • Fixes the improper sequence stored
  • Changes update hook to use config factory
  • Attempts to check for other plugin implementations (openid_connect_windows_aad stores a string)

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