updater: detect conda

[n3hrox]

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  Contributing document?

• Does your PR affect documented changes or does it add new functionality
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Resolves #2611

[n3hrox]

I have no idea how to get DeepSource to pass these minor issues. Recommended usage by python docs is subprocess.run. I've even tried using os. that is already imported and used as os.system but even moving this code to other place causes issue. Any idea how I could omit that? I don't see any way to check for conda without using some kind of system call.

[shcheklein]

@n3hrox thanks for the PR!

It's not the requirement to fix all the deepsource complaints.

@sanketsaurav may be this #2679 (comment) can be of some interest to you and you can recommend us a better way to deal with this.

[shcheklein]

are there tests for this? can we add one?

[n3hrox]

Added test and refactored _get_conda to _is_conda. Let me know if this is sufficient.
This PR is the first part for #2672 which I would also love to do if I find some spare time

[efiop]

When we start including this file into other packages, we would be able to simply delete this dvc/utils/pkg.py and have build.py(or maybe pkg.py if we decide to rename it) have PKG = "something" defined and then just from .build import PKG and use it instead of get_package_manager. That would look and feel very nice. 🙂

[n3hrox]

@efiop I will rework that method in the next PR where I include patches for other builds as well ;)

[efiop]

Thanks! 🎉