fix: Issue with processing variables in outgoing email content (#12799)

Co-authored-by: Shivam Mishra <scm.mymail@gmail.com>
Co-authored-by: Vinay Keerthi <11478411+stonecharioteer@users.noreply.github.com>
Co-authored-by: Sojan Jose <sojan@pepalo.com>

app/helpers/data_helper.rb

@@ -0,0 +1,24 @@
+# Provides utility methods for data transformation, hash manipulation, and JSON parsing.
+# This module contains helper methods for converting between different data types,
+# normalizing hashes, and safely handling JSON operations.
+module DataHelper
+  # Ensures a hash supports indifferent access (string or symbol keys).
+  # Returns an empty hash if the input is blank.
+  def ensure_indifferent_access(hash)
+    return {} if hash.blank?
+
+    hash.respond_to?(:with_indifferent_access) ? hash.with_indifferent_access : hash
+  end
+
+  def convert_to_hash(obj)
+    return obj.to_unsafe_h if obj.instance_of?(ActionController::Parameters)
+
+    obj
+  end
+
+  def safe_parse_json(content)
+    JSON.parse(content, symbolize_names: true)
+  rescue JSON::ParserError
+    {}
+  end
+end