Fix Linux/macOS native binary nesting in dotnet tool package

[Copilot]

When packing extension-less binaries (Linux/macOS cirup) with a PackagePath ending in the same name as the source file, MSBuild treats the final path segment as a directory, producing native/linux-x64/cirup/cirup instead of native/linux-x64/cirup. Windows was unaffected because cirup.exe carries an extension. This meant the dotnet tool silently installed but always failed to locate the native binary on Linux and macOS.

The same bug existed in both the old net10.0 RID-specific packages (0.4.0, 0.5.0) and in the new net8.0 single-package approach introduced in this PR.

Changes

• nuget/tool/Devolutions.Cirup.Tool.csproj: Add trailing backslash to PackagePath for all Linux/macOS binary entries, which tells MSBuild to treat the destination as a directory and preserve the source filename:

<!-- Before: creates native/linux-x64/cirup/cirup (directory nesting bug) -->
<None PackagePath="tools\net8.0\any\native\linux-x64\cirup" ... />

<!-- After: creates native/linux-x64/cirup (correct file path) -->
<None PackagePath="tools\net8.0\any\native\linux-x64\" ... />

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