Support skipping the repository for java_db and trivy_db repoistories if repo is down in addition to 429 and 5xx errors

[wargamez]

Description

We run a local oci mirror/proxy-cache for mirror.gcr.io, let's call it ocimirror.example.com, and we have that first in the list of repositories e.g --java-db-repository="ocimirror.example.com:5678/aquasec/trivy-java-db:1","mirror.gcr.io/aquasec/trivy-java-db:1" and same for --db-repository. I understand that today you only skip to the next in list if response code is 429 or 5xx. It would be really good and more stable if it also skipped on e.g lookup failure dns and/or unable to connect/timeouts. then eventually fail miserably if none in list went successfully....

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Vulnerability