Reason: if you don't want preflight checks, you don't want prearm checks
either (these are the circuit breakers, like usb connected check).
The other changes are cleanup and rework of operations.
In most cases, arming_state_transition is called with fRunPreArmChecks set
to true, so no change in behavior.
The cases with fRunPreArmChecks=false are:
- unit tests
- in_arming_grace_period=true (quick arming after disarm)
- VEHICLE_CMD_PREFLIGHT_CALIBRATION (does not transition to armed)
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