Sentry orders fail on newly created fleets

**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](https://github.com/user-attachments/files/26476318/fc2_52-53.zip)