Backport of build: cross compile darwin builds into release/1.19.x

[dhiaayachi]

Backport

This PR is auto-generated from hashicorp#21326 to be assessed for backporting due to the inclusion of the label backport/1.19.

The below text is copied from the body of the original PR.

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Description

For cost reasons, we can cross-compile macos binaries on linux. Historically we didn't do this because of a problem with Go that has since been resolved: hashicorp#3267.

This step removes the verification of Darwin binaries. I believe this is acceptable since the vast majority of users and on Linux and Windows. Developers will naturally test the Darwin build during the development cycle.

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Overview of commits

• eefed40