Adding New Default Image Config Value to IC.

[nharper285]

Summary of the Pull Request

What is this about?
We currently have default image value for linux and windows VMSS and VMs hard-coded into OneFuzz. When they need to be updated, we have to submit a PR. This change adds the value to our InstanceConfig.

PR Checklist

• Applies to work item: Create Instance Config Property for Default VMSS/VM Images #2229
• CLA signed. If not, go over here and sign the CLI.
• Tests added/passed
• Requires documentation to be updated
• I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx

Info on Pull Request

What does this include?

Validation Steps Performed

How does someone test & validate?

• Check-PR [Python]
• Check-PR [C#]
• Python - Manual verify scaleset default create works for Windows VMSS
• Python - Manual verify scaleset default create works for Linux VMSS
• Python - Manual verify scaleset create works with --image flag for Windows VMSS
• Python - Manual verify scaleset create works with --image flag for Linux VMSS
• Python - Manual verify scaleset create work with different instance_config Windows Image value
• Python - Manual verify scaleset create works with different instance_config Linux Image value
• Python - Manual verify proxy create work with instance_config Windows Image value
• Python - Manual verify proxy create works with instance_config Linux Image value
• Python - Manual verify repro create work with instance_config Windows Image value
• Python - Manual verify repro create works with instance_config Linux Image value
• C# - Manual verify scaleset default create works for Windows VMSS
• C# - Manual verify scaleset default create works for Linux VMSS
• C# - Manual verify scaleset create works with --image flag for Windows VMSS
• C# - Manual verify scaleset create works with --image flag for Linux VMSS
• C# - Manual verify scaleset create work with different instance_config Windows Image value
• C# - Manual verify scaleset create works with different instance_config Linux Image value
• C#- Manual verify proxy create work with instance_config Windows Image value
• C# - Manual verify proxy create works with instance_config Linux Image value
• C# - Manual verify repro create work with instance_config Windows Image value
• C# - Manual verify repro create works with instance_config Linux Image value

[codecov-commenter]

Codecov Report

Merging #2434 (5f04b76) into main (de766df) will increase coverage by 2.60%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2434      +/-   ##
==========================================
+ Coverage   29.85%   32.45%   +2.60%     
==========================================
  Files         289      170     -119     
  Lines       35083    23110   -11973     
==========================================
- Hits        10475     7501    -2974     
+ Misses      24608    15609    -8999     

Impacted Files	Coverage Δ
src/ApiService/ApiService/Functions/Scaleset.cs
src/ApiService/ApiService/OneFuzzTypes/Model.cs
src/ApiService/ApiService/OneFuzzTypes/Requests.cs
src/ApiService/ApiService/UserCredentials.cs
src/ApiService/ApiService/Functions/TimerRepro.cs
src/ApiService/ApiService/Functions/Webhooks.cs
...ApiService/ApiService/onefuzzlib/OnefuzzContext.cs
...Service/ApiService/onefuzzlib/WebhookOperations.cs
src/ApiService/ApiService/Functions/WebhookLogs.cs
.../ApiService/ApiService/onefuzzlib/JobOperations.cs
... and 109 more

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