Switch from 'Error' to 'Message' on related span messages.

Author: DanielRosenwasser

src/compiler/diagnosticMessages.json

@@ -2402,7 +2402,7 @@
         "code": 2727
     },
     "'{0}' is declared here.": {
-        "category": "Error",
+        "category": "Message",
         "code": 2728
     },
     "Property '{0}' is used before its initialization.": {
@@ -3886,7 +3886,7 @@
         "code": 7037
     },
     "Type originates at this import. A namespace-style import cannot be called or constructed, and will cause a failure at runtime. Consider using a default import or import require here instead.": {
-        "category": "Error",
+        "category": "Message",
         "code": 7038
     },
     "Mapped object type implicitly has an 'any' template type.": {