Change [System.Environment]::SetEnvironmentVariable() to Set-ItemProperty

[pkotov87]

Summary

Here was the method of set PSPath-Variable changed from [System.Environment]::SetEnvironmentVariable() to Set-ItemProperty. This brings a performance advantage, because the function can have [System.Environment]::SetEnvironmentVariable() timeouts (see also).

Additional Context

Add any additional context about the problem here.

• Root cause and the steps to reproduce. (If applicable)
• Thought process behind the implementation.

Related Issues (if any)

#363

Checklist

• 🟢 Spec tests.
• 🟢 Acceptance tests.
• Manually verified.

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