Convert AM packer templates into HCL2 #367
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This runs the `packer hcl2_upgrade` command on the template file of the Ubuntu 20.04 base image to use the new HCL2 format instead of the legacy JSON one.
These variables are not used in the template so it is safe to remove them.
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Packer 1.7 introduced the HCL2 format for templates which is more flexible and modular than the original JSON format and it's the recommended format now.
This updates the Ubuntu 20.04 base template and the AM box template to HCL2. The templates were initially upgraded with Packer's hcl2_upgrade command and then cleaned to remove unnecessary variables. Also, Packer plugin requirements are now declared in the templates.