Every provider should have "data to vuln object" unit test

[willmurphyscode]

What would you like to be added:

Every provider has unit tests that assert that it can process a representative sample of records - completeness of our ability to process provider data is asserted at the unit test level.

Why is this needed:

We recently had some bugs merged into vunnel that should have failed unit tests - this issue exists to track getting the test coverage high enough.

Additional context: The recent failure was in the debian provider, but we should check all the providers.

Providers:

• [x] alpine https://github.com/anchore/vunnel/pull/336
• [x] amazon https://github.com/anchore/vunnel/pull/337
• [x] centos
• [x] chainguard https://github.com/anchore/vunnel/pull/339
• [x] debian https://github.com/anchore/vunnel/pull/318
• [x] github https://github.com/anchore/vunnel/pull/346
• [x] mariner https://github.com/anchore/vunnel/pull/347
• [x] nvd https://github.com/anchore/vunnel/pull/340
• [x] oracle https://github.com/anchore/vunnel/pull/341
• [x] rhel https://github.com/anchore/vunnel/pull/342
• [x] sles https://github.com/anchore/vunnel/pull/343
• [x] ubuntu https://github.com/anchore/vunnel/pull/344
• [x] wolfi https://github.com/anchore/vunnel/pull/345

[willmurphyscode]

Snapshot tests for every provider have been merged.