refactor: Improve CNL message parsing in BodyParser

The code changes in `aviation_parser.go` and `aviation_parser_test.go` enhance the CNL message parsing logic in the `BodyParser` module. This ensures accurate extraction of data from CNL messages, including the category, aircraft ID, departure airport, and destination airport. The improvements improve the overall functionality and accuracy of the code.

internal/parsers/aviation_parser.go

@@ -203,10 +203,12 @@ func (bp *BodyParser) createBodyData(data map[string]string) (string, interface{
 	}
 }
 
-func Parse(rawText string) (*domain.ParsedMessage, error) {
+func Parse(rawText string) *domain.ParsedMessage {
 	message, err := ParseHeader(rawText)
 	if err != nil {
-		return nil, err
+		msg := domain.NewParsedMessage()
+		msg.Text = rawText
+		return msg
 	}
 
 	bodyParser := NewBodyParser(message.Body)
@@ -215,11 +217,12 @@ func Parse(rawText string) (*domain.ParsedMessage, error) {
 	message.ParsedAt = time.Now()
 
 	if err != nil {
-		return &message, err
+		message.Comments = err.Error()
+		return &message
 	}
-
+	message.Parsed = true
 	message.BodyData = bodyData
-	return &message, nil
+	return &message
 }
 
 func cleanMessage(text string) string {