Two new improvements for local TUF after feedback from @iansltx and QA
folks:
1. The static `42` was confusing when making or sharing several builds
of locally built fleetd. Locally TUF-built version of orbit will now be:
`YY.MM.XXXXX`, e.g. `25.5.56178` (patch version is a 16-bit number made
from day, hour and minute).
2. Also prompting user to delete `test_tuf` which is usually a source of
confusion/errors.
Lucas Manuel Rodriguez
a674a01144