WasmNativeWorkload=false doesn't work in wasm runs

To avoid wasm_tools to be required in wasm interpreter and wasm aot runs, the WasmNativeWorkload property should be set to false as below. Even though https://github.com/dotnet/BenchmarkDotNet/blob/f9a4c194b77aa7133168f240b404da58c47d5255/src/BenchmarkDotNet/Templates/WasmCsProj.txt#L16 and https://github.com/dotnet/BenchmarkDotNet/blob/6f453baafa4ef800e0377ebc463ffa82b2f76368/src/BenchmarkDotNet/Templates/WasmAotCsProj.txt#L19 attempted to make the fix, however, it doesn't work for some reason. To temporarily work around this issue, a directory.build.props file had to be inserted to the workitemdirectory of perf run on helix machine, which could have unexpected bad consequences since it is shared by all the perf runs. Fixing this issue is must-to-have. @naricc
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false

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