get-openstack-images/os-images-info: fix JOB_CHECKSUM ensure interpretation before hashing

Thomas Morinrequested to merge
fix-g-o-i-job_checksum into main

Closes #1552 (closed) which is due to a lack of interpretation of the items used to compute JOB_CHECKSUM for get-openstack-images unit: some items refer to os_images and sylva_diskimage_builder but they are used without enforcing interpretation first and unfortunately, in CI, these datastructures contain templates values.

Edited by Thomas Morin

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