fix: resolve NetworkAnimator conditional exit transitions

[ZakyB]

Purpose of this PR

Fixes #3912.

This PR resolves conditional transitions targeting an Exit node by following transitions through the parent state-machine hierarchy using GetStateMachineTransitions().

This supports both direct and nested Exit transitions, including transitions targeting another state machine. It prevents incorrect validation errors and allows late-joining clients to correctly synchronize the resulting animator state.

Jira ticket

Tracked by GitHub issue #3912.

Changelog

com.unity.netcode.gameobjects

• Fixed: NetworkAnimator now resolves conditional transitions through sub-state-machine Exit nodes.

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

Verified that a client joining during a State A -> Exit -> State B transition correctly synchronizes with the transition and reaches State B without validation or destination-state errors.

Automated tests:

• Covered by existing automated tests
• Covered by new automated tests

Added EditMode coverage for direct and nested Exit transitions, including transitions targeting another state machine.

Does the change require QA team to:

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

Up-port

Not needed; this PR targets develop-3.x.x.

Backports

Worth considering for supported 2.x branches, as the issue was also reported on NGO 2.12.0.

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[cla-assistant-unity]

All committers have signed the CLA.

[NoelStephensUnity]

@ZakyB
First pass glance, this looks like a nice contribution. We have marked this PR for a follow up. It could be towards the end of this month or slightly after as our time is allocated towards unified netcode. Just letting you know that we will be following up on this.
👍 🥇