Gcz auth updates lr

Type of change

• Bug Fix
• Feature

Does this introduce a change in the core logic?

• [YES/NO]

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

• AWS
• Azure
• GCP
• IBM

Does this introduce a breaking change?

• [YES/NO]

What is the new/expected behavior?

• Can now disable Auth on a layer-by-layer basis - helpful in the event where only some layers are intended to be protected
• Can now specify the GCZ_AUTH_SECRET as an environment variable. This secret is known only to the server hosting GCZ Provider and is used to encode/decode a token for GCZ_ENABLE_AUTH authorization purposes.
• Environment Variable Documentation updated for new GCZ_AUTH_SECRET variable.
• Testing Documentation updated to reflect new Security features
• Testing Documentation updated to highlight potential ArcGIS Pro workflow