Backport of [HPR-1184] hcp: support HCP_PROJECT_ID environment variable into release/1.9.x #12453
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Backport
This PR is auto-generated from #12452 to be assessed for backporting due to the inclusion of the label backport/1.9.x.
The below text is copied from the body of the original PR.
With HCP supporting multi-projects now, Packer needs to take it into account when picking a project from an organisation.
This commit adds two cases:
multiple projects are defined, none is supplied through HCP_PROJECT_ID: in this case we will default to the oldest project defined for the organisation.
we supply HCP_PROJECT_ID: in this case, we pick the project with the corresponding ID, and use it for publishing metadata.