feat: Adding API v2 Source Finding sample

[rafaelMurata]

Description

b/339808836

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[bot]]

Here is the summary of changes.

You are about to add 4 region tags.

- [security-center/snippets/v2/createFinding.js:22](https://github.com/rafaelMurata/nodejs-docs-samples/blob/a68e7c1f15942e85ded97bc08f1711a9464dac26/security-center/snippets/v2/createFinding.js#L22), tag `securitycenter_create_finding_v2` - [security-center/snippets/v2/createSource.js:22](https://github.com/rafaelMurata/nodejs-docs-samples/blob/a68e7c1f15942e85ded97bc08f1711a9464dac26/security-center/snippets/v2/createSource.js#L22), tag `securitycenter_create_source_v2` - [security-center/snippets/v2/listAllFindings.js:22](https://github.com/rafaelMurata/nodejs-docs-samples/blob/a68e7c1f15942e85ded97bc08f1711a9464dac26/security-center/snippets/v2/listAllFindings.js#L22), tag `securitycenter_list_all_findings_v2` - [security-center/snippets/v2/listFilteredFindings.js:22](https://github.com/rafaelMurata/nodejs-docs-samples/blob/a68e7c1f15942e85ded97bc08f1711a9464dac26/security-center/snippets/v2/listFilteredFindings.js#L22), tag `securitycenter_list_filtered_findings_v2`

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