[Feature Request]: Append to log file when using hop run instead of deleting content / overwriting file

### What would you like to happen?

When you use hop_run.bat and want to save the logs in a file that already exists, the content is deleted instead of being added.
Is it possible to add an option to concatenate logs or change the default behavior?
In my example, I'd like to obtain one log file per day containing all executions logs.
This is the behavior of kettle, for example.

E:\apache-hop-client-2.9\hop\hop-run.bat -j test_hop -r local -f E:\Process_Apache_Hop\projets\test_hop\workflow_file.hwf --level BASIC --logfile=E:\Logs\Hop\test_hop_%date:~6,4%%date:~3,2%%date:~0,2%.log

### Issue Priority

Priority: 3

### Issue Component

Component: Hop Run

Start with the hop_run.bat entry point and trace how its --logfile option handles an existing file. Define whether appending is opt-in or the default, then verify that repeated executions produce one combined daily log without deleting earlier content.

Written by the indexing model from the issue text.