Disable cmdline check on nix

[badgeratu]

Description

When running on a non-Windows platform, disable the attempt to obtain the command-line arguments for other running daprd processes as it requires a native system call that is currently only available on Windows.

The downside is that Sidekick will not be able to attach to an existing running daprd instance and may launch a second duplicate instance for the same AppId and AppPort, which would then fail to start (as Dapr doesn't allow multiple instances on the same machine with the same AppId). We can reinstate that functionality on *nix if a community member implements the required native system calls for querying command-line arguments.

Issue reference

Unable to load shared library 'kernel32.dll' on macOS #11

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation where possible

[codecov-commenter]

Codecov Report

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Flag	Coverage Δ
net35	85.43% <0.00%> (?)
net48	86.72% <0.00%> (?)
net5.0	88.28% <0.00%> (?)

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