Feature/improve posthog logs

[hjoaquim]

This PR proposes the following:

• improving handling of logging handlers --> changing the responsibility to the SystemModel instead

• adding the commithash to the system so it gets logged

• don't send logs to S3 if posthog is an active handler

• branch name on the posthog logs

Fixes #4303 by clearly identify the branch name for each event (posthog) and each session (file/s3).

[andrewkenreich]

We can update this so it shows something

[andrewkenreich]

also if i follow this route

Load up terminal in guest

Run a few commands

Login

Run a few more commands

• I dont get alliased anymore - im guessing we dont update the user after in a certain spot?

[hjoaquim]

Nice catch! I think last commits solves both comments thank you, @andrewkenreich

[hjoaquim]

Pls only merge this PR after #4941