fix(flows): enhance error logs when injecting default values

Avoid logging unnecessary full exception error stacktrace
when an error occurred while injecting plugin defaults -
Those errors can be logged often and can be temporary.

core/src/main/java/io/kestra/core/serializers/YamlParser.java

@@ -6,6 +6,7 @@ import com.fasterxml.jackson.databind.DeserializationFeature;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.exc.InvalidTypeIdException;
 import com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException;
+import io.kestra.core.models.flows.FlowInterface;
 import io.kestra.core.models.validations.ManualConstraintViolation;
 import jakarta.validation.ConstraintViolationException;
 import org.apache.commons.io.FilenameUtils;
@@ -50,7 +51,7 @@ public final class YamlParser {
     }
 
     private static <T> String type(Class<T> cls) {
-        return cls.getSimpleName().toLowerCase();
+        return FlowInterface.class.isAssignableFrom(cls) ? "flow" : cls.getSimpleName().toLowerCase();
     }
 
     public static <T> T parse(File file, Class<T> cls) throws ConstraintViolationException {

core/src/main/java/io/kestra/core/services/PluginDefaultService.java

@@ -197,14 +197,8 @@ public class PluginDefaultService {
         try {
             return this.injectAllDefaults(flow, false);
         } catch (Exception e) {
-            logger.warn(
-                "Can't inject plugin defaults on tenant {}, namespace '{}', flow '{}' with errors '{}'",
-                flow.getTenantId(),
-                flow.getNamespace(),
-                flow.getId(),
-                e.getMessage(),
-                e
-            );
+            String cause = e.getCause() != null ? e.getCause().getMessage() : e.getMessage();
+            logService.get().logExecution(flow, logger, Level.WARN, "Unable to inject plugin defaults. Cause: '{}'", cause);
             return readWithoutDefaultsOrThrow(flow);
         }
     }
@@ -309,7 +303,7 @@ public class PluginDefaultService {
             result = parseFlowWithAllDefaults(flow.getTenantId(), flow.getNamespace(), flow.getRevision(), flow.isDeleted(), source, true, false);
         } catch (Exception e) {
             if (safe) {
-                logService.get().logExecution(flow, log, Level.ERROR, "Failed to read flow.", e);
+                logService.get().logExecution(flow, log, Level.WARN, "Unable to inject plugin default versions. Cause: {}", e.getMessage());
                 result = FlowWithException.from(flow, e);
 
                 // deleted is not part of the original 'source'