enhancement(Chronicle Unstructured): Add support for all Google SecOps regional endpoints

[ChocPanda]

Summary

Change Type

• Bug fix
• New feature
• Non-functional (chore, refactoring, docs)
• Performance

Is this a breaking change?

• Yes
• No

How did you test this PR?

Testing was limited as I don't have access to a chronicle instance outside of europe, however, the risk is minimal as this change just adds Google published endpoints to the available configuration options

Does this PR include user facing changes?

• Yes. Please add a changelog fragment based on our guidelines.
• No. A maintainer will apply the "no-changelog" label to this PR.

Checklist

• Please read our Vector contributor resources.
• If this PR introduces changes Vector dependencies (modifies Cargo.lock), please
  run dd-rust-license-tool write to regenerate the license inventory and commit the changes (if any). More details here.

References

https://cloud.google.com/chronicle/docs/reference/ingestion-api#regional_endpoints

[ChocPanda]

I will re-raise, but my commit history has become corrupted