feat: add v2 API for resource notification config Go client libraries

[vijaykanthm]

Description

Reference to https://b.corp.google.com/issues/339692211 This PR adds v2 API to create, list, get, update, delete, receive notifications of the samples.

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

Checklist

• [ ] I have followed Contributing Guidelines from CONTRIBUTING.MD
• [ ] Tests pass: go test -v ./.. (see Testing)
• [ ] Code formatted: gofmt (see Formatting)
• [ ] Vetting pass: go vet (see Formatting)
• [ ] 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)
• [ ] 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

[conventional-commit-lint-gcf[bot]]

🤖 I detect that the PR title and the commit message differ and there's only one commit. To use the PR title for the commit history, you can use Github's automerge feature with squashing, or use automerge label. Good luck human!

-- conventional-commit-lint bot https://conventionalcommits.org/

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 6 region tags.

- [securitycenter/notificationsv2/create_notification_config.go:17](https://github.com/vijaykanthm/golang-samples/blob/6c52d052fcc6e5a8d582dcd25c6d2baefac5a578/securitycenter/notificationsv2/create_notification_config.go#L17), tag `securitycenter_create_notification_config_v2` - [securitycenter/notificationsv2/delete_notification_config.go:17](https://github.com/vijaykanthm/golang-samples/blob/6c52d052fcc6e5a8d582dcd25c6d2baefac5a578/securitycenter/notificationsv2/delete_notification_config.go#L17), tag `securitycenter_delete_notification_config_v2` - [securitycenter/notificationsv2/get_notification_config.go:17](https://github.com/vijaykanthm/golang-samples/blob/6c52d052fcc6e5a8d582dcd25c6d2baefac5a578/securitycenter/notificationsv2/get_notification_config.go#L17), tag `securitycenter_get_notification_config_v2` - [securitycenter/notificationsv2/list_notification_configs.go:17](https://github.com/vijaykanthm/golang-samples/blob/6c52d052fcc6e5a8d582dcd25c6d2baefac5a578/securitycenter/notificationsv2/list_notification_configs.go#L17), tag `securitycenter_list_notification_configs_v2` - [securitycenter/notificationsv2/receive_notifications.go:17](https://github.com/vijaykanthm/golang-samples/blob/6c52d052fcc6e5a8d582dcd25c6d2baefac5a578/securitycenter/notificationsv2/receive_notifications.go#L17), tag `securitycenter_receive_notifications_v2` - [securitycenter/notificationsv2/update_notification_config.go:17](https://github.com/vijaykanthm/golang-samples/blob/6c52d052fcc6e5a8d582dcd25c6d2baefac5a578/securitycenter/notificationsv2/update_notification_config.go#L17), tag `securitycenter_update_notification_config_v2`

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