Add security marks samples

[arthurlapertosa]

Description

Fixes #

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Checklist

• [ ] I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• [x] Tests pass: npm test (see Testing)
• [x] 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[bot]]

Here is the summary of changes.

You are about to add 4 region tags.

- [security-center/snippets/v2/addFindingSecurityMarks.js:20](https://github.com/arthurlapertosa/nodejs-docs-samples/blob/5327a0b055247ebb3c769642a63dbf67bd9b9661/security-center/snippets/v2/addFindingSecurityMarks.js#L20), tag `securitycenter_add_finding_security_marks_v2` - [security-center/snippets/v2/deleteAndUpdateSecurityMarks.js:20](https://github.com/arthurlapertosa/nodejs-docs-samples/blob/5327a0b055247ebb3c769642a63dbf67bd9b9661/security-center/snippets/v2/deleteAndUpdateSecurityMarks.js#L20), tag `securitycenter_add_delete_security_marks_v2` - [security-center/snippets/v2/deleteSecurityMarks.js:21](https://github.com/arthurlapertosa/nodejs-docs-samples/blob/5327a0b055247ebb3c769642a63dbf67bd9b9661/security-center/snippets/v2/deleteSecurityMarks.js#L21), tag `securitycenter_delete_security_marks_v2` - [security-center/snippets/v2/listFindingsWithSecurityMarks.js:18](https://github.com/arthurlapertosa/nodejs-docs-samples/blob/5327a0b055247ebb3c769642a63dbf67bd9b9661/security-center/snippets/v2/listFindingsWithSecurityMarks.js#L18), tag `securitycenter_list_findings_with_security_marks_v2`

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