Remove unused presto_api and plazma_api configuration settings

These API endpoint configurations are no longer needed since the corresponding
TD_PRESTO_API and TD_PLAZMA_API environment variables have been removed from
the workflow files. Completing the cleanup of unused pytd-related settings.

Author: koshilife

engage-box/roi_reporting/workflows/reporting_agent/config.yaml

@@ -20,8 +20,6 @@ td:
 
   # API settings
   api_server: "https://api.treasuredata.com"
-  presto_api: "https://api-presto.treasuredata.com"
-  plazma_api: "https://api-plazma.treasuredata.com"
   cdp_api: "https://api-cdp.treasuredata.com"
   engage_api: "https://engage-api.treasuredata.com"