[AI] Navigation System can be constructed in situations where the NavigationObjectRepository subsystem is not valid

Investigate and fix all calls where the Navigation System is constructed without the NavigationObjectRepository subsystem being valid. 

1. Create a clean TP_ThirdPerson project or use an existing project.
2. Cook the project, including the maps, with -RunAssetValidation or -RunMapValidation.

1. 1. Arguments I used "-run=cook -TargetPlatforms=Windows -CookAll -RunAssetValidation"

Expected Result: The cook completes successfully with no warnings (at least for navigation)

Actual Result: The cook completes with the null Navigation Repository warning

There are other code paths where this is possible, but this example was provided by UDN licensee.

>    UnrealEditor-NavigationSystem.dll!UNavigationSystemV1::UNavigationSystemV1(const FObjectInitializer & ObjectInitializer) Line 947    C++
     UnrealEditor-CoreUObject.dll!StaticConstructObject_Internal(const FStaticConstructObjectParameters & Params) Line 4934    C++
     [Inline Frame] UnrealEditor-Engine.dll!NewObject(UObject *) Line 1835    C++
     UnrealEditor-Engine.dll!UNavigationSystemConfig::CreateAndConfigureNavigationSystem(UWorld & World) Line 35    C++
     UnrealEditor-Engine.dll!FNavigationSystem::AddNavigationSystemToWorld(UWorld & WorldOwner, const FNavigationSystemRunMode RunMode, UNavigationSystemConfig * NavigationSystemConfig, const bool bInitializeForWorld, const bool bOverridePreviousNavSys) Line 100    C++
     UnrealEditor-Engine.dll!UWorld::InitWorld(const FWorldInitializationValues IVS) Line 2249    C++
     UnrealEditor-UnrealEd.dll!UCookOnTheFlyServer::ValidateSourcePackage(UE::Cook::FPackageData & PackageData, UPackage * Package) Line 3323    C++
     UnrealEditor-UnrealEd.dll!UCookOnTheFlyServer::LoadPackageInQueue(UE::Cook::FPackageData & PackageData, unsigned int & ResultFlags, int & OutNumPushed) Line 3175    C++
     UnrealEditor-UnrealEd.dll!UCookOnTheFlyServer::PumpLoads(UE::Cook::FTickStackData & StackData, unsigned int DesiredQueueLength, int & OutNumPushed, bool & bOutBusy) Line 2998    C++
     [Inline Frame] UnrealEditor-UnrealEd.dll!IsEngineExitRequested() Line 390    C++
     UnrealEditor-UnrealEd.dll!UCookOnTheFlyServer::TickMainCookLoop(UE::Cook::FTickStackData & StackData) Line 1531    C++
     UnrealEditor-UnrealEd.dll!UCookOnTheFlyServer::TickCookByTheBook(const float TimeSlice, ECookTickFlags TickFlags) Line 1411    C++
     UnrealEditor-UnrealEd.dll!UCookCommandlet::RunCookByTheBookCook(UCookOnTheFlyServer * CookOnTheFlyServer, void * StartupOptionsAsVoid, ECookByTheBookOptions CookOptions) Line 595    C++
     UnrealEditor-UnrealEd.dll!UCookCommandlet::CookByTheBook(const TArray<ITargetPlatform *,TSizedDefaultAllocator<32>> & Platforms) Line 548    C++
     UnrealEditor-UnrealEd.dll!UCookCommandlet::Main(const FString & CmdLineParams) Line 268    C++
     UnrealEditor.exe!FEngineLoop::PreInitPostStartupScreen(const wchar_t * CmdLine) Line 4167    C++
     [Inline Frame] UnrealEditor.exe!FEngineLoop::PreInit(const wchar_t *) Line 4464    C++
     [Inline Frame] UnrealEditor.exe!EnginePreInit(const wchar_t *) Line 40    C++
     UnrealEditor.exe!GuardedMain(const wchar_t * CmdLine) Line 143    C++
     UnrealEditor.exe!LaunchWindowsStartup(HINSTANCE__ * hInInstance, HINSTANCE__ * hPrevInstance, char * __formal, int nCmdShow, const wchar_t * CmdLine) Line 267    C++
     UnrealEditor.exe!WinMain(HINSTANCE__ * hInInstance, HINSTANCE__ * hPrevInstance, char * pCmdLine, int nCmdShow) Line 335    C++
     [Inline Frame] UnrealEditor.exe!invoke_main() Line 102    C++
     UnrealEditor.exe!__scrt_common_main_seh() Line 288    C++
     kernel32.dll!00007ff99f7e7374()    Unknown
     ntdll.dll!00007ff9a149cc91()    Unknown

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