tofu-infra: refactor imports
This is a two-fold change:
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Put the import id in the same YAML files as the rest of the data This allows for easier visual identification of each element.
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Refactor imports code in the root module to a separate file. This helps the root module to stay within a reasonable size.
Bug: T370037 Signed-off-by: Arturo Borrero Gonzalez aborrero@wikimedia.org