Minor performance improvements setting up intervention's log

- Initialize `log` temporary value on construction instead of doing
  default initialization and then calling `append`.
- Leverage `std::string_view` to replace `const std::string&` parameters
  in `utils::string::replaceAll` to avoid creating a `std::string`
  object (and associated allocation and copy) for the string literal`%d`

src/transaction.cc

@@ -1492,9 +1492,8 @@ bool Transaction::intervention(ModSecurityIntervention *it) {
         it->status = m_it.status;
 
         if (m_it.log != NULL) {
-            std::string log("");
-            log.append(m_it.log);
-            utils::string::replaceAll(&log, std::string("%d"),
+            std::string log(m_it.log);
+            utils::string::replaceAll(log, "%d",
                 std::to_string(it->status));
             it->log = strdup(log.c_str());
         } else {