Truncate database script: Show "started" timestamp for both steps

As a short term solution to #8236 I would like to be able to know exactly when someone has started the "backup database" part of the truncate_database.bat script [here](https://github.com/ISISComputingGroup/ibex_utils/blob/master/installation_and_upgrade/truncate_database.bat)

Ideally this should be added to the python that this batch script calls and made a utility so we can add timestamps to other places too.

### Acceptance criteria
- [ ] A way of showing the timestamp as a step is started is added to ibex_utils
- [ ] This is used when we start the "Backup database" and potentially "Truncate database" steps called by truncate_database.bat