fix: players spawned by session owner when scene management disabled don't synchronize

[NoelStephensUnity]

Purpose of this PR (WIP)

Fixing issue where spawning a player in distributed authority mode via a client, typically session owner, other than the newly connected client and scene management is disabled then the already spawned players will not properly get synchronized by each owning client due to the newly connected client's identifier already being added prior to synchronization.

Jira ticket

(WIP)

Changelog

• Fixed: Issue where spawning a player in distributed authority mode via a client, typically session owner, other than the newly connected client and scene management is disabled then the already spawned players will not properly get synchronized by each owning client due to the newly connected client's identifier already being added prior to synchronization.

Documentation

• No documentation changes or additions were necessary.

Testing & QA (How your changes can be verified during release Playtest)

Functional Testing

Manual testing :

• Manual testing done
  • Using modified version of fix: NetworkVariable clearing dirty flags after OnNetworkSpawn #3779

Automated tests:

• Covered by existing automated tests
• Covered by new automated tests (WIP)

Does the change require QA team to:

• Review automated tests?
• Execute manual tests?
• Provide feedback about the PR?

If any boxes above are checked the QA team will be automatically added as a PR reviewer.

Backports

DA specific, does not require backport.

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[michalChrobot]

LGTM (beside missing Jira ticket which I guess we should have since it's an older issue)