chore: api v2 notifications samples

[rafaelMurata]

Description

Fixes: https://buganizer.corp.google.com/issues/331816847

Note: Before submitting a pull request, please open an issue for discussion if you are not associated with Google.

Checklist

• I have followed Sample Format Guide
• pom.xml parent set to latest shared-configuration
• Appropriate changes to README are included in PR
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• Tests pass: mvn clean verify required
• Lint passes: mvn -P lint checkstyle:check required
• Static Analysis: mvn -P lint clean compile pmd:cpd-check spotbugs:check advisory only
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 5 region tags.

• security-command-center/snippets/src/main/java/vtwo/notifications/CreateNotification.java:17, tag securitycenter_create_notification_config
• security-command-center/snippets/src/main/java/vtwo/notifications/DeleteNotification.java:17, tag securitycenter_delete_notification_config
• security-command-center/snippets/src/main/java/vtwo/notifications/GetNotification.java:17, tag securitycenter_get_notification_config
• security-command-center/snippets/src/main/java/vtwo/notifications/ListNotification.java:17, tag securitycenter_list_notification_configs
• security-command-center/snippets/src/main/java/vtwo/notifications/UpdateNotification.java:17, tag securitycenter_update_notification_config

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[Sita04]

@rafaelMurata Error log for your reference:

[ERROR] vtwo.NotificationIT Time elapsed: 0.532 s <<< ERROR! com.google.api.gax.rpc.PermissionDeniedException: io.grpc.StatusRuntimeException: PERMISSION_DENIED: PubSub topic projects/project-a-id/topics/test-topic does not exist. Caused by: io.grpc.StatusRuntimeException: PERMISSION_DENIED: PubSub topic projects/project-a-id/topics/test-topic does not exist.

[Sita04]

Thanks for the snippets! LGTM