Allow Hold Mode Without Requiring GPS

[TeddyZaremba]

Describe problem solved by the proposed feature

We're unable to put any drone in hold mode when using vision instead of a GPS.

Describe your preferred solution

PX4 handles hold mode without a GPS natively.

Describe possible alternatives

In the past we've gotten around it by sending offboard commands telling the drone to keep its position.

Additional context

Created an issue to track this PR made by @dakejahl
#24335