fix: return empty string if dereferncing pom var fails #2797
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Previously, Syft would attempt to dereference pom variables, but if it detected a cycle or failed to get back to a non-variable value, it would return the last variable. Instead, return an empty string. Otherwise, certain jars will have versions like "${project.version}" in the SBOM, which is not helpful.
This is a follow up to #2783 and improves the behavior around #2776.