Standardize exception messages

CliFx/Infrastructure/DefaultTypeActivator.cs

@@ -21,7 +21,7 @@ public class DefaultTypeActivator : ITypeActivator
         {
             throw CliFxException.InternalError(
                 $"""
-                Failed to create an instance of type `{type.FullName}`, could not access the constructor.
+                Failed to create an instance of type `{type.FullName}` because an appropriate constructor is not available.
                 Default type activator is only capable of instantiating a type if it has a public parameterless constructor.
                 To fix this, either add a parameterless constructor to the type or configure a custom activator for the application.
                 """,

CliFx/Utils/StackFrame.cs

@@ -86,7 +86,7 @@ internal partial class StackFrame
             // exception so that it's shown to the user.
             throw new FormatException(
                 $"""
-                Could not parse stacktrace:
+                Failed to parse stacktrace:
                 {stackTrace}
                 """
             );