feat: Add API v2 finding samples

[rafaelMurata]

Description

Fixes #https://buganizer.corp.google.com/issues/333521328

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

Checklist

• [x] I have followed Sample Format Guide
• [ ] pom.xml parent set to latest shared-configuration
• [ ] Appropriate changes to README are included in PR
• [ ] 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)
• [x] Tests pass: mvn clean verify required
• [x] Lint passes: mvn -P lint checkstyle:check required
• [ ] Static Analysis: mvn -P lint clean compile pmd:cpd-check spotbugs:check advisory only
• [ ] 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 3 region tags.

- [security-command-center/snippets/src/main/java/vtwo/findings/CreateFindings.java:19](https://github.com/rafaelMurata/java-docs-samples/blob/eacb5614afbc2901c328df51e0f0ba7bb4680903/security-command-center/snippets/src/main/java/vtwo/findings/CreateFindings.java#L19), tag `securitycenter_create_findings_v2` - [security-command-center/snippets/src/main/java/vtwo/findings/SetFindingsByState.java:19](https://github.com/rafaelMurata/java-docs-samples/blob/eacb5614afbc2901c328df51e0f0ba7bb4680903/security-command-center/snippets/src/main/java/vtwo/findings/SetFindingsByState.java#L19), tag `securitycenter_set_findings_by_state_v2` - [security-command-center/snippets/src/main/java/vtwo/source/CreateSource.java:19](https://github.com/rafaelMurata/java-docs-samples/blob/eacb5614afbc2901c328df51e0f0ba7bb4680903/security-command-center/snippets/src/main/java/vtwo/source/CreateSource.java#L19), tag `securitycenter_create_source_v2`

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[Sita04]

@rafaelMurata PTAL

[rafaelMurata]

/gcbrun

[rafaelMurata]

@Sita04 please run kokoro again. Thanks.