NativeAOT: Reenable -dead_strip platform linker optimization by def…

…ault (#20796)

### Description

NativeAOT now properly marks all symbols as non-deadstrippable in the object file it generates: dotnet/runtime@d9a6607
And uses `-dead_strip` as the default build option.

In this PR we are doing the same - reenabling the `-dead_strip` as the default platform linker switch.
This reverts previous workaround introduced in: f212f6b 

### Size savings

| MySingleView | Main | This PR | diff (%) |
|--------------|------|---------|----------|
| SOD (MB)     | 2,87 | 2,70    | -5,99%   |
|,ipa (MB)    | 1,22 | 1,17    | -4,61%   |

Even though this brings `4-5%` size reduction for a MySingleView app, the size savings are not proportional to the app size, as the savings are coming from stripping native libraries only. 
Based on measurements reported in dotnet/runtime@d9a6607 the actual expected savings for a MAUI app are around `~1.5%`.

---
Fixes #18605 and dotnet/runtime#88032

---------

Co-authored-by: Ivan Povazan <ivan.povazan@gmail.com>

tools/dotnet-linker/Steps/ComputeNativeBuildFlagsStep.cs

@@ -1,7 +1,6 @@
 using System.Collections.Generic;
 
 using Xamarin.Utils;
-using Xamarin.Bundler;
 
 #nullable enable
 
@@ -52,8 +51,7 @@ protected override void TryEndProcess ()
 				Configuration.Application.DeadStrip = false;
 
 			var mainLinkerFlags = new List<MSBuildItem> ();
-			// Do not pass -dead_strip to the native linker with object files generated by NativeAOT compiler as it can cause the linker to seg fault
-			if (Configuration.Application.DeadStrip && Configuration.Application.XamarinRuntime != XamarinRuntime.NativeAOT) {
+			if (Configuration.Application.DeadStrip) {
 				mainLinkerFlags.Add (new MSBuildItem ("-dead_strip"));
 			}
 			Configuration.WriteOutputForMSBuild ("_AssemblyLinkerFlags", mainLinkerFlags);