Fix for 1.X: Persistent Memory Leak when reloading domain and using Distance-based Ghost Importance

Reproduction steps:
1. Open the attached project "ReproProj"
2. Open the “/Assets/Kickball.unity” Scene
3. Enter Play Mode
4. Exit Play Mode
5. In menu bar click “Tools > Reload Tools”
6. In the Reload Tools window click “Reload Domain“
7. Observe the Console

Expected result: No persistent memory leaks exists
Actual result: Message “Leak Detected : Persistent allocates 1 individual allocations“ is present

Reproducible with: 6000.0.63f1, 6000.2.14f1, 6000.3.0f1, 6000.4.0a3 (05fffdb25ae2)
Not reproducible with: 6000.4.0a5
Fixed in: 6000.5.0a1 (0136d7329743)

Testing environment: Windows 10 Enterprise 21H2
Not reproducible on: No other environment tested

Notes:

• With 6000.4.0a3 and 6000.4.0a4 only sometimes reproducible
• The enabling logic is located in GoInGameServerSystem.cs, where GhostDistanceData singleton and GhostImportance component are added