[GPCAPIM-395]: Update PDS API secret handling

- Normalize line endings for PDS API secret in environment values
- Update test values to use base64 encoding for PDS API secret
- Adjust environment variable names for consistency with PDS integration

Author: DWolfsNHS

gateway-api/src/gateway_api/apim_app_auth/environment.py

@@ -36,6 +36,8 @@ def values() -> Environment:
             base64.b64decode(get_environment_variable("PDS_API_SECRET", str))
             .decode("utf-8")
             .replace("\\n", "\n")
+            .replace("\r\n", "\n")
+            .replace("\r", "\n")
             .strip()
         )
         _environment = Environment(

gateway-api/src/gateway_api/apim_app_auth/test_environment.py

@@ -1,3 +1,4 @@
+import base64
 import os
 from datetime import timedelta
 from unittest.mock import MagicMock, patch
@@ -25,10 +26,10 @@ def test_session_manager(self) -> None:
     def test_values(self) -> None:
         os.environ["CLIENT_TIMEOUT"] = "30s"
         os.environ["APIM_TOKEN_URL"] = "token_url"  # noqa S105 - dummy value
-        os.environ["APIM_PRIVATE_KEY"] = "private_key"
-        os.environ["APIM_API_KEY"] = "api_key"
+        os.environ["PDS_API_SECRET"] = base64.b64encode(b"private_key").decode("utf-8")
+        os.environ["PDS_API_TOKEN"] = "api_key"  # noqa S105 - dummy value
         os.environ["APIM_TOKEN_EXPIRY_THRESHOLD"] = "60s"  # noqa S105 - dummy value
-        os.environ["APIM_KEY_ID"] = "key_id"
+        os.environ["PDS_API_KID"] = "key_id"
 
         environ = environment.values()