.NET 9.0 work item creation

[kshyju]

Description

.NET 9 support tracking items:

Tasks

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1. Setting _ToolingSuffix for V9.0 TargetFrameworkVersion #2497
   .NET 9 enhancement +2
   
2. .NET project template updates to support .NET 9 #2555
   .NET 9 +1
   
3. Update Core worker package to target .NET 9 #2556
   .NET 9 +1
   
4. Tooling feed updates to support .NET 9 azure-functions-tooling-feed#550
   +0
   
5. Docker images for .NET 9 - Dedicated #2558
   .NET 9 +1
6. Docker images for .NET 9 - Consumption #2559
   .NET 9 +1
7. Docker images for .NET 9 - Flex Consumption #2561
   .NET 9 +1
8. Portal/Stack API updates for .NET 9 #2562
   .NET 9 Needs: Attention 👋 +2
   
9. Core Tools updates for .NET 9 #2560
   .NET 9 +1
   
10. Validate .NET 9 deployment scenarios #2563
    .NET 9 +1
    
11. Add .NET 9 perf apps. #2564
    .NET 9 Needs: Triage (Functions) +2
    
12. Create .NET9 cold start SLA sites. #2565
    .NET 9 +1
    
13. Windows placeholder pools and templates for .NET 9 #2567
    .NET 9 +1
    
14. Linux Consumption pools for .NET 9 #2568
    .NET 9 +1
15. Flex Consumption pools for .NET 9 #2569
    .NET 9 +1
16. Linux dedicated/EP image precache for .NET 9 #2570
    .NET 9 +1
    
17. Linux Consumption precache for .NET 9 #2572
    .NET 9 Needs: Triage (Functions) +2
    
18. Documentation updates for .NET 9 #2571
    .NET 9 +1
    

[fabiocav]

Created sub-items. Closed in favor of project view.