container-registry: API deprecation

[glasnt]

The container-registry samples are currently returning errors in testing (e.g. #10129)

[ERROR] PERMISSION_DENIED: note creation is not allowed for note kind VULNERABILITY

Failing tests (10/10 @Tests for this doc set)

• testFindVulnerabilitiesForImage
• testCreateOccurrence
• testOccurrencesForImage
• testDeleteOccurrence
• testPollDiscoveryOccurrenceFinished
• testFindHighSeverityVulnerabilitiesForImage
• testOccurrencesForNote
• testCreateNote
• testDeleteNote
• testPubSub

This API has been deprecated; example docs page cited in samples https://cloud.google.com/container-registry/docs/container-analysis#supported_metadata_types

However, they're still referenced in active docs: https://cloud.google.com/artifact-analysis/docs/create-notes-occurrences#artifact-analysis-create-note-java

A temporary workaround to unblock #10129 is to skip these tests