Persist TestrunMessages and store timestamp

So far, the Testrun messages are in addition to the Tesstrun.output column

lib/runner/strategy.rb

@@ -33,7 +33,7 @@ class Runner::Strategy
     raise NotImplementedError
   end
 
-  def attach_to_execution(_command, _event_loop)
+  def attach_to_execution(_command, _event_loop, _starting_time)
     raise NotImplementedError
   end
 

lib/runner/strategy/docker_container_pool.rb

@@ -108,7 +108,7 @@ class Runner::Strategy::DockerContainerPool < Runner::Strategy
     Rails.logger.debug { "#{Time.zone.now.getutc.inspect}: Finished copying files" }
   end
 
-  def attach_to_execution(command, event_loop)
+  def attach_to_execution(command, event_loop, starting_time)
     reset_inactivity_timer
 
     @command = command
@@ -119,7 +119,7 @@ class Runner::Strategy::DockerContainerPool < Runner::Strategy
     begin
       Timeout.timeout(@execution_environment.permitted_execution_time) do
         socket.send_data(command)
-        yield(socket)
+        yield(socket, starting_time)
         event_loop.wait
         event_loop.stop
       end

lib/runner/strategy/null.rb

@@ -25,11 +25,11 @@ class Runner::Strategy::Null < Runner::Strategy
 
   def copy_files(_files); end
 
-  def attach_to_execution(command, event_loop)
+  def attach_to_execution(command, event_loop, starting_time)
     socket = Connection.new(nil, self, event_loop)
     # We don't want to return an error if the execution environment is changed
     socket.status = :terminated_by_codeocean if command == ExecutionEnvironment::VALIDATION_COMMAND
-    yield(socket)
+    yield(socket, starting_time)
     socket
   end
 

lib/runner/strategy/poseidon.rb

@@ -133,10 +133,10 @@ class Runner::Strategy::Poseidon < Runner::Strategy
     Rails.logger.debug { "#{Time.zone.now.getutc.inspect}: Finished copying files" }
   end
 
-  def attach_to_execution(command, event_loop)
+  def attach_to_execution(command, event_loop, starting_time)
     websocket_url = execute_command(command)
     socket = Connection.new(websocket_url, self, event_loop)
-    yield(socket)
+    yield(socket, starting_time)
     socket
   end