[msbuild] Use the fully resolved path when computing the relative path for the LogicalName property. Fixes #20330.

[rolfbjarne]

This fixes an issue where we'd compute a LogicalName property that was outside
of the app bundle, resulting in broken resources in the app bundle (in
particular the app icon would be missing).

So instead of something like this:

LogicalName: ../../../../../../../../../tmp/testapp/obj/Debug/net8.0-ios/iossimulator-arm64/actool/bundle/Assets.car

we'll now get:

LogicalName: Assets.car

and the icons will be correctly embedded in the app bundle.

Fixes #20330.

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Legacy Xamarin (No breaking changes)

• iOS (no change detected)
• tvOS (no change detected)
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NET (empty diffs)

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• 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

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✅ cecil: All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (iOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (MacCatalyst): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (macOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (Multiple platforms): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (tvOS): All 1 tests passed. Html Report (VSDrops) Download
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✅ install-source: All 1 tests passed. Html Report (VSDrops) Download
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✅ introspection: All 8 tests passed. Html Report (VSDrops) Download
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✅ mmp: All 2 tests passed. Html Report (VSDrops) Download
✅ mononative: All 6 tests passed. Html Report (VSDrops) Download
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✅ monotouch (macOS): All 8 tests passed. Html Report (VSDrops) Download
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