Fix compile error in UE 5.2

[prwc]

• Ignore to trigger deprecated delegate in 5.2 ( OnSessionCustomDataChanged )
• Use GetTypeHashHelper since GetTypeHash was moved to hidden friend ref: https://github.com/EpicGames/UnrealEngine/commit/6f488a9e07260936b2d770bd97cbd181ba0b0da7

[prwc]

@microsoft-github-policy-service agree