fix: DynamicAddressablesNetworkPrefabs showing loading status on already spawned prefabs [MTT-6688]

[fernando-cortez]

Description

This PR fixes the "Loading" state being displayed inside the API Playground scene when the host hits the Spawn

Issue Number(s)

MTT-6688

Repro steps:

• Open scene 05_API Playground Showcasing All Post-Connection Use-Cases
• Hit play
• Host
• Hit Try Spawn Synchronously button
• Observe that the loading state of the loading prefab transitions from Loading to Loaded (this can happen quickly), but does not get stuck on Loading.

This was reproduceable on just the host, but testing the same steps with a ParrelSync client connected would be appreciated for sanity's sake.

Contribution checklist

• [ N/A ] Tests have been added for the project and/or any internal package
• Release notes have been added to the project changelog file
• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• JIRA ticket ID is in the PR title or at least one commit message
• Include the ticket ID number within the body message of the PR to create a hyperlink

[jilfranco-unity]

Tested with a host and a client and it looks good to me!