Fix manifest updates when we match a layer by TOC digest #2294
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Either return a compressed digest and compressed size, or an uncompressed digest and an uncompressed size (if we are allowed to change the manifest); if neither is possible, ignore the match and force a layer pull.
In almost all cases, a TOC match implies the layer has a TOC digest annotation, i.e. the input manifest is OCI, where the size field is mandatory; so this should not change which layers will be reused
Fixes #2218 (comment) .
Cc: @giuseppe