fix: multiple temp directories on command executions

[bermuell]

Description

Closes: #3348

A temporary home directory is created when running gaia, which is not deleted when pre-instantiation is finished.
Beside that, in case a temp directory couldn't be created, the default gaia home was returned and deleted!

This fix:

• deletes the temporary directory once the temporary bootstrapping phase is done
• panics in case a temporary home directory canot be created instead of returning default gaia home

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[MSalopek]

LGTM