Sentry orders fail on newly created fleets

[ekolis]

Describe the bug
If you create a fleet, then issue a sentry order on the same turn, the sentry order fails to be issued, as it's being issued based on the temporary client side ID of the new fleet.

Steps to reproduce

1. Create a fleet
2. Issue the new fleet a sentry order
3. Process the turn

Expected behavior
The fleet now has a sentry order.

Actual behavior
A message appears in the turn log about an order being issued to an invalid object ID.

Screenshots

Related issues
N/A

Testing plan
???

Additional context

fc2_52-53.zip