Rename TOKEN_SVC_URL to SAUTH_SERVICE_TOKEN_V2_URL

Type of change

• Bug Fix
• Feature

Does this introduce a change in the core logic?

• [Yes]

Does this introduce a change in the cloud provider implementation, if so which cloud?

• AWS
• Azure
• GCP
• IBM

Updates description?

Rename environment variable TOKEN_SVC_URL to SAUTH_SERVICE_TOKEN_V2_URL and delete unused environment variable AUTHENTICATION_SAFETY_THRESHOLD