fix: use case-insensitive comparison for infrastructures

Author: GhostofGoes

src/python/phenix_apps/apps/sceptre/configs/configs.py

@@ -3,6 +3,9 @@
 
 
 def get_fdconfig_class(infrastructure: str) -> type:
+    # no reason for this to be case-sensitive
+    infrastructure = infrastructure.lower().strip()
+
     if infrastructure == 'power-transmission':
         base_class = infra.PowerTransmissionInfrastructure
     elif infrastructure == 'power-distribution':