feat: Adding API v2 Source samples

[rafaelMurata]

Description

b/337023783

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

Checklist

• [ ] 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
• [x] 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-command-center/snippets/src/main/java/vtwo/source/GetSource.java:19](https://github.com/rafaelMurata/java-docs-samples/blob/4f50bf053ba75a287166b715260ac2116069df2d/security-command-center/snippets/src/main/java/vtwo/source/GetSource.java#L19), tag `securitycenter_get_source_v2` - [security-command-center/snippets/src/main/java/vtwo/source/ListSources.java:19](https://github.com/rafaelMurata/java-docs-samples/blob/4f50bf053ba75a287166b715260ac2116069df2d/security-command-center/snippets/src/main/java/vtwo/source/ListSources.java#L19), tag `securitycenter_list_sources_v2` - [security-command-center/snippets/src/main/java/vtwo/source/UpdateFindingSource.java:19](https://github.com/rafaelMurata/java-docs-samples/blob/4f50bf053ba75a287166b715260ac2116069df2d/security-command-center/snippets/src/main/java/vtwo/source/UpdateFindingSource.java#L19), tag `securitycenter_update_finding_source_properties_v2` - [security-command-center/snippets/src/main/java/vtwo/source/UpdateSource.java:19](https://github.com/rafaelMurata/java-docs-samples/blob/4f50bf053ba75a287166b715260ac2116069df2d/security-command-center/snippets/src/main/java/vtwo/source/UpdateSource.java#L19), tag `securitycenter_update_source_v2`

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[Sita04]

@rafaelMurata Kindly add the AfterClass method to clean up the resources created during setup

[rafaelMurata]

@rafaelMurata Kindly add the AfterClass method to clean up the resources created during setup

done.

[rafaelMurata]

@Sita04 Please run kokoro again. Thanks.

[rafaelMurata]

@Sita04 Please run kokoro again. Thanks.