Avoid double instrumentation in .NET

[mmanciop]

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Describe the issue you're reporting

When the .NET application is built with the .NET SDK inside, we would inject a second SDK, and that is unsupported in the OTel SDK for .NET. We should detect using a mix of /proc/maps and dlsym to find out if the .NET app already comes in with a built-in OTel SDK, and avoid injection in those cases.

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