Add ProductCode in registry for MSI install

[adityapatwardhan]

PR Summary

Add a registry key for the generated ProductCode using an MSI install. This is useful for doing an uninstallation by reading the reg key and avoids calling WMI for it.

PR Context

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[PaulHigin]

@adityapatwardhan Please take a look at failing tests.

[pull-request-quantifier-deprecated]

This PR has 21 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Quantification details

Label      : Extra Small
Size       : +21 -0
Percentile : 8.4%

Total files changed: 2

Change summary by file extension:
.wxs : +1 -0
.ps1 : +20 -0

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[adityapatwardhan]

We should wait for at least 1 preview release before backporting this.

[ghost]

🎉v7.4.0-preview.4 has been released which incorporates this pull request.:tada:

Handy links:

• Release Notes