feat(scc): add samples for SCC v2 findings

[thokalavinod]

Related to b/339692150 https://cloud.google.com/security-command-center/docs/reference/rest/v2/organizations.sources.locations.findings

Fixes #

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

Checklist

• [ ] I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• [ ] README is updated to include all relevant information
• [ ] Tests pass: nox -s py-3.9 (see Test Environment Setup)
• [ ] Lint pass: nox -s lint (see Test Environment Setup)
• [ ] 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 sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners 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.

- [securitycenter/snippets_v2/snippets_findings_v2.py:21](https://github.com/thokalavinod/python-docs-samples/blob/9947b51cc9572a6c91c0c1f90c04984d8e4087be/securitycenter/snippets_v2/snippets_findings_v2.py#L21), tag `securitycenter_list_all_findings` - [securitycenter/snippets_v2/snippets_findings_v2.py:54](https://github.com/thokalavinod/python-docs-samples/blob/9947b51cc9572a6c91c0c1f90c04984d8e4087be/securitycenter/snippets_v2/snippets_findings_v2.py#L54), tag `securitycenter_list_filtered_findings` - [securitycenter/snippets_v2/snippets_findings_v2.py:88](https://github.com/thokalavinod/python-docs-samples/blob/9947b51cc9572a6c91c0c1f90c04984d8e4087be/securitycenter/snippets_v2/snippets_findings_v2.py#L88), tag `securitycenter_group_all_findings` - [securitycenter/snippets_v2/snippets_findings_v2.py:114](https://github.com/thokalavinod/python-docs-samples/blob/9947b51cc9572a6c91c0c1f90c04984d8e4087be/securitycenter/snippets_v2/snippets_findings_v2.py#L114), tag `securitycenter_group_filtered_findings`

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[Sita04]

@thokalavinod

The samples differ from the Java ones here: https://github.com/GoogleCloudPlatform/java-docs-samples/tree/main/security-command-center/snippets/src/main/java/vtwo/findings

Kindly reconcile python samples to match with Java.