[Feature Request]: Support non-default Google Cloud universe domains (GOOGLE_CLOUD_UNIVERSE_DOMAIN)

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@shunping is already working on this.

Since Oct 14, 2026.

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Description

go java new feature P2 python
What would you like to happen?

Beam should work in Google Cloud universes other than the default googleapis.com (e.g. Trusted Partner Cloud / sovereign clouds), where the client libraries pick the universe from GOOGLE_CLOUD_UNIVERSE_DOMAIN.

Today several places hard-code GDU URLs or pass them as explicit endpoint overrides. An explicit endpoint override takes precedence over the universe domain, so the configured universe is ignored.

Internal bug: 290704327

Issue Priority

Priority: 2 (default / most feature requests should be filed as P2)

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