cmMakefile: invoke callback after command execution

`cmMakefile` has a hook that invokes a callback before each command
execution.  The only user of that hook is `cmCTestScriptHandler`,
which uses it to update the elapsed time since it was started.
The `ctest_sleep` command again updates the elapsed time explicitly.
This explicit update can be saved by invoking the callback after
the command execution instead.

Source/CTest/cmCTestSleepCommand.cxx

@@ -20,8 +20,6 @@ bool cmCTestSleepCommand::InitialPass(std::vector<std::string> const& args,
   unsigned int time1 = atoi(args[0].c_str());
   if (args.size() == 1) {
     cmCTestScriptHandler::SleepInSeconds(time1);
-    // update the elapsed time since it could have slept for a while
-    this->CTestScriptHandler->UpdateElapsedTime();
     return true;
   }
 
@@ -32,8 +30,6 @@ bool cmCTestSleepCommand::InitialPass(std::vector<std::string> const& args,
     if (time1 + duration > time2) {
       duration = (time1 + duration - time2);
       cmCTestScriptHandler::SleepInSeconds(duration);
-      // update the elapsed time since it could have slept for a while
-      this->CTestScriptHandler->UpdateElapsedTime();
     }
     return true;
   }

Source/cmMakefile.cxx

@@ -486,10 +486,6 @@ bool cmMakefile::ExecuteCommand(const cmListFileFunction& lff,
     return result;
   }
 
-  if (this->ExecuteCommandCallback) {
-    this->ExecuteCommandCallback();
-  }
-
   // Place this call on the call stack.
   cmMakefileCall stack_manager(this, lff, std::move(deferId), status);
   static_cast<void>(stack_manager);
@@ -545,6 +541,10 @@ bool cmMakefile::ExecuteCommand(const cmListFileFunction& lff,
     }
   }
 
+  if (this->ExecuteCommandCallback) {
+    this->ExecuteCommandCallback();
+  }
+
   return result;
 }