Re-enable HLT conditions updates

Re-enable the TrigCoolUpdateHelper in HltEventLoopMgr to handle COOL folder updates during the run.

• Don't rely on EndOfBeginRun incident, instead just call the relevant method from HltEventLoopMgr during prepareForRun
• Retrieve the CTP fragment and decode the extra payload in the tool rather than in the HltEventLoopMgr.
• The CheckIOV incident is no longer needed (see ATEAM-477)
• Use Monitored infrastructure for monitoring

Also update one of our testing scripts to be able to run in standalone mode. The code is functional as is, but it will require further extensive testing i.e. in MT.