(GH-2550) Do not ship with PuppetBolt PowerShell module

[beechtom]

This updates the Windows MSI build to not install the PuppetBolt
PowerShell module. Users should now install the PuppetBolt PowerShell
module through the PowerShell Gallery.

[beechtom]

Built the MSI and installed on a Windows 10 Ent VM. Confirmed that the MSI does not install the PowerShell module.

[beechtom]

Also confirmed that upgrading Bolt successfully removes the PuppetBolt module installed with older MSIs.

[jpogran]

Approved, code works and is tested in all the ways I can think of

[lucywyman]

Note: Since this is a breaking change and we've pretty well missed the boat on Bolt 3.0, we're going to add a deprecation warning to the MSI when the module is imported telling users to install the module themselves from PowerShell Gallery, and add documentation telling users to do so as well. We'll wait until Bolt 4.0 to merge this.

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