feat: Adding API v2 Source Finding Mute 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]

Here is the summary of changes.

You are about to add 28 region tags.

• security-center/snippets/v2/bulkMuteFindings.js:24, tag securitycenter_bulk_mute_v2
• security-center/snippets/v2/createBigQueryExport.js:22, tag securitycenter_create_bigquery_export_v2
• security-center/snippets/v2/createFinding.js:27, tag securitycenter_create_finding_v2
• security-center/snippets/v2/createMuteRule.js:22, tag securitycenter_create_mute_config_v2
• security-center/snippets/v2/createNotificationConfig.js:24, tag securitycenter_create_notification_config_v2
• security-center/snippets/v2/createSource.js:22, tag securitycenter_create_source_v2
• security-center/snippets/v2/deleteBigQueryExport.js:22, tag securitycenter_delete_bigquery_export_v2
• security-center/snippets/v2/deleteMuteRule.js:22, tag securitycenter_delete_mute_config_v2
• security-center/snippets/v2/deleteNotificationConfig.js:21, tag securitycenter_delete_notification_config_v2
• security-center/snippets/v2/getBigQueryExport.js:22, tag securitycenter_get_bigquery_export_v2
• security-center/snippets/v2/getIamPolicy.js:21, tag securitycenter_get_iam_policies_v2
• security-center/snippets/v2/getMuteRule.js:22, tag securitycenter_create_mute_config_v2
• security-center/snippets/v2/getNotificationConfig.js:21, tag securitycenter_get_notification_config_v2
• security-center/snippets/v2/groupFindings.js:23, tag securitycenter_group_all_findings_v2
• security-center/snippets/v2/groupFindingsWithFilter.js:23, tag securitycenter_group_filtered_findings_v2
• security-center/snippets/v2/listAllFindings.js:22, tag securitycenter_list_all_findings_v2
• security-center/snippets/v2/listAllMuteRules.js:22, tag securitycenter_list_mute_configs_v2
• security-center/snippets/v2/listBigQueryExports.js:22, tag securitycenter_list_bigquery_export_v2
• security-center/snippets/v2/listFilteredFindings.js:22, tag securitycenter_list_filtered_findings_v2
• security-center/snippets/v2/listNotificationConfigs.js:20, tag securitycenter_list_notification_configs_v2
• security-center/snippets/v2/receiveNotifications.js:23, tag securitycenter_receive_notifications
• security-center/snippets/v2/setIamPolicy.js:21, tag securitycenter_set_iam_polices_v2
• security-center/snippets/v2/setMuteFinding.js:24, tag securitycenter_set_mute_v2
• security-center/snippets/v2/setUnmuteFinding.js:24, tag securitycenter_set_unmute_v2
• security-center/snippets/v2/testIam.js:21, tag securitycenter_test_iam_permissions_v2
• security-center/snippets/v2/updateBigQueryExport.js:22, tag securitycenter_update_bigquery_export_v2
• security-center/snippets/v2/updateMuteRule.js:22, tag securitycenter_update_mute_config_v2
• security-center/snippets/v2/updateNotificationConfig.js:25, tag securitycenter_update_notification_config_v2

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