occasional duplicate flow runs

[j-tr]

First check

• [X] I added a descriptive title to this issue.
• [X] I used the GitHub search to find a similar issue and didn't find it.
• [X] I searched the Prefect documentation for this issue.
• [X] I checked that this issue is related to Prefect and not one of its dependencies.

Bug summary

Occasionally, the Prefect agent submits duplicate flow runs to the infrastructure.

Reproduction

This happens randomly once in a while on a setup that is otherwise working fine.

Error

Agent log output:

17:31:08.214 | INFO    | prefect.agent - Submitting flow run 'f7b431a0-051f-4808-bc63-915f8bfb8265'
17:31:16.124 | INFO    | prefect.agent - Completed submission of flow run 'f7b431a0-051f-4808-bc63-915f8bfb8265'
17:31:17.056 | INFO    | prefect.agent - Submitting flow run 'f7b431a0-051f-4808-bc63-915f8bfb8265'
17:31:25.208 | INFO    | prefect.agent - Completed submission of flow run 'f7b431a0-051f-4808-bc63-915f8bfb8265'

### Versions

```Text
Version:             2.8.3
API version:         0.8.4
Python version:      3.8.15
Git commit:          07de1ac4
Built:               Thu, Feb 23, 2023 4:31 PM
OS/Arch:             linux/x86_64

Additional context

No response