Use FF to get node disposal strategy

[tevoinea]

Summary of the Pull Request

What is this about?

Use the new App Configuration service to set the node disposal strategy.

This is not a breaking change because each deploy would reset the NodeDisposalStrategy value to scale_in. For this new version, the behavior will be the same (reset to scale_in) but going forward, the state will persist across deploys.

Info on Pull Request

What does this include?

• Remove loading NodeDisposalStrategy from azure functions configuration.
• Load NodeDisposalStrategy from App Configuration instead.

[codecov-commenter]

Codecov Report

Merging #2713 (5e4083a) into main (4c1adb6) will increase coverage by 0.64%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2713      +/-   ##
==========================================
+ Coverage   29.36%   30.00%   +0.64%     
==========================================
  Files         291      196      -95     
  Lines       36202    25136   -11066     
==========================================
- Hits        10631     7543    -3088     
+ Misses      25571    17593    -7978     

Impacted Files	Coverage Δ
src/agent/onefuzz/src/auth.rs	30.17% <0.00%> (-0.37%)	⬇️
src/agent/onefuzz-agent/src/config.rs	0.00% <0.00%> (ø)
src/ApiService/ApiService/ServiceConfiguration.cs
...ervice/ApiService/onefuzzlib/ScalesetOperations.cs
...Service/ApiService/onefuzzlib/WebhookOperations.cs
src/ApiService/ApiService/onefuzzlib/Subnet.cs
...Service/ApiService/Functions/QueueSignalREvents.cs
src/ApiService/ApiService/onefuzzlib/Containers.cs
...ice/ApiService/TestHooks/NsgOperationsTestHooks.cs
src/ApiService/ApiService/Functions/Download.cs
... and 144 more

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