fix(core): no longer lowercasing PluginClassIdentifier to have proper…

… validation upon Plugin deserialization

closes #7387

core/src/main/java/io/kestra/core/plugins/DefaultPluginRegistry.java

@@ -217,7 +217,7 @@ public static ClassTypeIdentifier create(final String identifier) {
             if (identifier == null || identifier.isBlank()) {
                 throw new IllegalArgumentException("Cannot create plugin identifier from null or empty string");
             }
-            return new ClassTypeIdentifier(identifier.toLowerCase(Locale.ROOT));
+            return new ClassTypeIdentifier(identifier);
         }
 
         /**