feat(securitycenter): add finding sources iam samples

[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]

Here is the summary of changes.

You are about to add 17 region tags.

• security-center/snippets/v2/bulkMuteFindings.js:21, tag securitycenter_bulk_mute_v2
• security-center/snippets/v2/createFinding.js:19, tag securitycenter_create_finding_v2
• security-center/snippets/v2/createSource.js:19, tag securitycenter_create_source_v2
• security-center/snippets/v2/getIamPolicy.js:19, tag securitycenter_get_iam_policies_v2
• security-center/snippets/v2/getSource.js:19, tag securitycenter_get_source_v2
• security-center/snippets/v2/groupFindings.js:20, tag securitycenter_group_all_findings_v2
• security-center/snippets/v2/groupFindingsWithFilter.js:20, tag securitycenter_group_filtered_findings_v2
• security-center/snippets/v2/listAllFindings.js:19, tag securitycenter_list_findings_v2
• security-center/snippets/v2/listAllSources.js:19, tag securitycenter_list_sources_v2
• security-center/snippets/v2/listFilteredFindings.js:19, tag securitycenter_list_filtered_findings_v2
• security-center/snippets/v2/setFindingState.js:19, tag securitycenter_set_findings_by_state_v2
• security-center/snippets/v2/setIamPolicy.js:19, tag securitycenter_set_iam_polices_v2
• security-center/snippets/v2/setMuteFinding.js:21, tag securitycenter_set_mute_v2
• security-center/snippets/v2/setUnmuteFinding.js:21, tag securitycenter_set_unmute_v2
• security-center/snippets/v2/testIam.js:19, tag securitycenter_test_iam_permissions_v2
• security-center/snippets/v2/updateFindingSource.js:21, tag securitycenter_update_finding_source_properties_v2
• security-center/snippets/v2/updateSource.js:19, tag securitycenter_update_source_v2

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