Update Snyk Enrichment to filter out non-Snyk packages

[DerekStrickland]

Description

• When the Snyk Enrichment provider was originally written it was the only source of Package data.
• Now that the GitHub Provider is running against multiple GitHub orgs, the Snyk provider is attempting to process Package entries that are not relevant to it.
• These end up in the logs as errors which is not ideal from an observability and monitoring perspective.
• The Snyk Enrichment Task process loop needs to detect that the Package doesn't have a Snyk Xref, log an info level message that the Package is being skipped for this reason, and then continue to the next package without ever calling the Snyk service.
• We should NOT modify the Snyk service, since we want to maintain this error handling as a way to detect any future similar logic problems.

[sbolel]

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