Cannot convert argument "entryNameEncoding", with value: "True", for "ExtractToDirectory" to type "System.Text.Encoding"

[johnsimons]

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Describe the bug
When the host has no .NetCore installed and no Powershell Core the tool cache api can throw the following error:

Cannot convert argument "entryNameEncoding", with value: "True", for "ExtractToDirectory" to type "System.Text.Encoding": "Cannot convert value "True" to type "System.Text.Encoding". Error: "Invalid cast from 'System.Boolean' to 'System.Text.Encoding'.""

The issue is because in this code, you are passing $true as the 3rd arg to ExtractToDirectory, but according to the https://docs.microsoft.com/en-us/dotnet/api/system.io.compression.zipfile.extracttodirectory?view=netframework-4.8#overloads, in .NetFramework that argument is suppose to be the encoding, not a boolean.

To Reproduce
Steps to reproduce the behavior:

1. Run the api mentioned above in a host without .netcore

Expected behavior
I expect it to extract the zip on the Windows host.

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: Window server 2012 R2
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.