tests/reproducible-test.bst: Test reproducibility on all elements

We do not follow build dependencies, so both components and output have to be listed. Also base elements that are split through filter have to be listed for the moment.

sdk.bst and platform.bst are explictly added as safety in case it was forbidden in components.bst. oci/debug-oci.bst is omitted due to the time and size it takes to build it. Snaps are not added yet.

Part of #107