[dotnet] Make 'Full' the default link mode for NativeAOT.

[rolfbjarne]

Make 'Full' the default link mode for all platforms for NativeAOT because:

• It will achieve the best app size.
• NativeAOT is not a drop-in replacement that's guaranteed to work - there are
  already known features NativeAOT don't support (and may never support), so
  this may be an opportunity for app developers (and component vendors) to
  make their products trimmer safe.
• NativeAOT will be in preview in .NET 8, so we can change our mind later if
  it turns out to cause too many problems.
• In some cases NativeAOT might require trimming, because we may
  optimize/rewrite assemblies to be NativeAOT-compatible to support existing
  libraries.

This requires #18666 to be merged first, so that ests aren't linked away.

[dalexsoto]

Perfect! 👍

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✅ API diff for current PR / commit

Legacy Xamarin (No breaking changes)

• iOS (no change detected)
• tvOS (no change detected)
• watchOS (no change detected)
• macOS (no change detected)

NET (empty diffs)

• iOS: (empty diff detected)
• tvOS: (empty diff detected)
• MacCatalyst: (empty diff detected)
• macOS: (empty diff detected)

✅ API diff vs stable

Legacy Xamarin (No breaking changes)

• iOS: vsdrops gist (No breaking changes)
• tvOS: vsdrops gist (No breaking changes)
• watchOS: vsdrops gist (No breaking changes)
• macOS: vsdrops gist (No breaking changes)

.NET (No breaking changes)

• iOS: vsdrops gist (No breaking changes)
• tvOS: vsdrops gist (No breaking changes)
• MacCatalyst: vsdrops gist (No breaking changes)
• macOS: vsdrops gist (No breaking changes)
• Microsoft.iOS vs Microsoft.MacCatalyst: vsdrops gist

Legacy Xamarin (stable) vs .NET

• iOS: vsdrops gist
• tvOS: vsdrops gist
• macOS: vsdrops gist

ℹ️ Generator diff

Generator Diff: vsdrops (html) vsdrops (raw diff) gist (raw diff) - Please review changes)

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• xamarin.ios-16.5.0.749.pkg
• xamarin.mac-9.4.0.749.pkg

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✅ mac_binding_project: All 1 tests passed. Html Report (VSDrops) Download
✅ mmp: All 2 tests passed. Html Report (VSDrops) Download
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