feat(findings): Add findings v2 resources

[vijaykanthm]

Description

Reference to https://b.corp.google.com/issues/339692211 This PR adds v2 API for the List findings, List findings with filter, Group findings, Group findings with filter, List findings with Security marks, Group findings by state, Create a Source, Get a Source, List Security Sources, Update a Source.

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

Checklist

• [ ] I have followed Contributing Guidelines from CONTRIBUTING.MD
• [ ] Tests pass: go test -v ./.. (see Testing)
• [ ] Code formatted: gofmt (see Formatting)
• [ ] Vetting pass: go vet (see Formatting)
• [ ] 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 11 region tags.

- [securitycenter/findingsv2/add_security_marks.go:17](https://github.com/vijaykanthm/golang-samples/blob/a0ff30c5a5484683b5dd91cfe8f0804aa487b1d0/securitycenter/findingsv2/add_security_marks.go#L17), tag `securitycenter_add_finding_security_marks_v2` - [securitycenter/findingsv2/create_source.go:17](https://github.com/vijaykanthm/golang-samples/blob/a0ff30c5a5484683b5dd91cfe8f0804aa487b1d0/securitycenter/findingsv2/create_source.go#L17), tag `securitycenter_create_source_v2` - [securitycenter/findingsv2/get_source.go:17](https://github.com/vijaykanthm/golang-samples/blob/a0ff30c5a5484683b5dd91cfe8f0804aa487b1d0/securitycenter/findingsv2/get_source.go#L17), tag `securitycenter_get_source_v2` - [securitycenter/findingsv2/group_filtered_findings.go:17](https://github.com/vijaykanthm/golang-samples/blob/a0ff30c5a5484683b5dd91cfe8f0804aa487b1d0/securitycenter/findingsv2/group_filtered_findings.go#L17), tag `securitycenter_group_filtered_findings_v2` - [securitycenter/findingsv2/group_findings.go:17](https://github.com/vijaykanthm/golang-samples/blob/a0ff30c5a5484683b5dd91cfe8f0804aa487b1d0/securitycenter/findingsv2/group_findings.go#L17), tag `securitycenter_group_findings_v2` - [securitycenter/findingsv2/group_findings_state.go:17](https://github.com/vijaykanthm/golang-samples/blob/a0ff30c5a5484683b5dd91cfe8f0804aa487b1d0/securitycenter/findingsv2/group_findings_state.go#L17), tag `securitycenter_group_filtered_state_v2` - [securitycenter/findingsv2/list_all_findings.go:17](https://github.com/vijaykanthm/golang-samples/blob/a0ff30c5a5484683b5dd91cfe8f0804aa487b1d0/securitycenter/findingsv2/list_all_findings.go#L17), tag `securitycenter_list_all_findings_v2` - [securitycenter/findingsv2/list_filtered_findings.go:17](https://github.com/vijaykanthm/golang-samples/blob/a0ff30c5a5484683b5dd91cfe8f0804aa487b1d0/securitycenter/findingsv2/list_filtered_findings.go#L17), tag `securitycenter_list_filtered_findings_v2` - [securitycenter/findingsv2/list_findings_with_security_mark.go:17](https://github.com/vijaykanthm/golang-samples/blob/a0ff30c5a5484683b5dd91cfe8f0804aa487b1d0/securitycenter/findingsv2/list_findings_with_security_mark.go#L17), tag `securitycenter_list_findings_with_security_marks_v2` - [securitycenter/findingsv2/list_sources.go:17](https://github.com/vijaykanthm/golang-samples/blob/a0ff30c5a5484683b5dd91cfe8f0804aa487b1d0/securitycenter/findingsv2/list_sources.go#L17), tag `securitycenter_list_sources_v2` - [securitycenter/findingsv2/update_source.go:17](https://github.com/vijaykanthm/golang-samples/blob/a0ff30c5a5484683b5dd91cfe8f0804aa487b1d0/securitycenter/findingsv2/update_source.go#L17), tag `securitycenter_update_source_v2`

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