Reduce sbom_occurrences table writes

What does this MR do and why?

Reduce sbom_occurrences table writes

sbom_occurrences is currently responsible for 2-9% of total WAL volumne on GitLab.com. In an effort to reduce this volume, this MR changes the ingestion code so that it will only attempt to update records if one or more of their attributes have been changed.

Relates to: https://gitlab.com/gitlab-org/gitlab/-/issues/442486

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