ci: fix go sdk publish to embed version (#1323)
Follows the workflow defined in ci-mgmt
(https://github.com/pulumi/ci-mgmt/blob/7c1f0521b8f04aff46732c6656659c85d60fd9c4/provider-ci/test-workflows/aws/.github/workflows/release.yml#L149-L186)
as the basis for this change. This ensures that during the publishing
step, we download the Go SDK artifact which contains the correctly
embedded version. We then use the `pulumi/publish-go-sdk-action` action
to commit/push the new files and cut a new sdk tag for this.
Fixes: #1322
