[release/8.0] Add registry search for upgrade policy keys #15047
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Backport of #14975 to release/8.0
Description
Add registry search operations to Windows installer bundles. The search operation will check for a global and version specific registry key. The version specific key takes precedence when present.
This is related to a customer request and part of a larger change. This PR only includes infrastructure changes to support changes in the Windows installer bundles.
Risk
Low, this change only adds detection for the key, nothing will currently act on its value.
Testing
Verified against a private build of Windows Desktop. Additional testing will be done once all the pieces are in place across runtime, desktop, sdk, ASP.NET to verify all the installers.