.NET 8 Upgrade Silenced Errors Fix (#30469)

* [Dev][Build] .NET 8 Upgrade Silenced errors first fix.

* [Dev][Build] .NET 8 Upgrade Silenced errors. CA1859

* [Dev][Build] .NET 8 Upgrade Silenced errors. CA1854.

* [Dev][Build] .NET 8 Upgrade Silenced errors. CA1860

* [Dev][Build] .NET 8 Upgrade Silenced errors. CA1861

* [Dev][Build] .NET 8 Upgrade Silenced errors. CA1862

* [Dev][Build] .NET 8 Upgrade Silenced errors. CA1863

* [Dev][Build] .NET 8 Upgrade Silenced errors. CA1864

* [Dev][Build] .NET 8 Upgrade Silenced errors. CA1865

* [Dev][Build] .NET 8 Upgrade Silenced errors. CA2208

* [Dev][Build] .NET 8 Upgrade Silenced errors. CS9191

* [Dev][Build] .NET 8 Upgrade Silenced errors. Spell check

* [Dev][Build] .NET 8 Upgrade Silenced errors. Spell check

* [Dev][Build] .NET 8 Upgrade Silenced errors.
- CompositeFormat variables used more than once in the same file were assigned to a single variable.
- GetProcessesByName logic fix.
- String comparion fix.
- ArgumentOutOfRangeException message change.

* [Dev][Build] .NET 8 Upgrade Silenced errors.
- Null check added.
- static readonly CompositeFormat added for all fields.

src/common/AllExperiments/Experiments.cs

@@ -145,7 +145,7 @@ namespace AllExperiments
 
         private string? AssignmentUnit { get; set; }
 
-        private IVariantAssignmentRequest GetVariantAssignmentRequest()
+        private VariantAssignmentRequest GetVariantAssignmentRequest()
         {
             var jsonFilePath = CreateFilePath();
             try