feat: Adding API v2 security marks samples

[rafaelMurata]

Description

b/349784034

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

Checklist

• I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• Tests pass: npm test (see Testing)
• Lint pass: npm run lint (see Style)
• 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 pull request is from a branch created directly off of GoogleCloudPlatform/nodejs-docs-samples. Not a fork.
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new sample directory, and I created GitHub Actions workflow 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 4 region tags.

• security-center/snippets/v2/addFindingSecurityMarks.js:20, tag securitycenter_add_finding_security_marks_v2
• security-center/snippets/v2/deleteAndUpdateSecurityMarks.js:20, tag securitycenter_add_delete_security_marks_v2
• security-center/snippets/v2/deleteSecurityMarks.js:21, tag securitycenter_delete_security_marks_v2
• security-center/snippets/v2/listFindingsWithSecurityMarks.js:18, tag securitycenter_list_findings_with_security_marks_v2

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[subfuzion]

Hi @rafaelMurata, thanks for submitting. I'm going to take a look at this and your other pending pull requests and get you updates within the next five days.

[subfuzion]

Hi @rafaelMurata, this PR is failing for same reasons as #3722. Please apply the same guidance I gave there for resolving the issues.