Tag error_class on timed_operation failures

Corrected the indentation of the rescue block for better readability and consistency.

Author: converliz

lib/entitlements.rb

@@ -401,6 +401,9 @@ def self.timed_operation(phase:, provider: nil, target: nil, span: "leaf", concu
       result = yield
       tags[1] = "status:success"
       result
+    rescue => e
+      tags << "error_class:#{e.class.name}"
+      raise
     end
   end