feat: Regional Access Boundary Changes#891

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vverman wants to merge 9 commits intogoogleapis:trust_boundaryfrom

vverman:trust-boundary-upto-speed

Commits on Jan 14, 2026

Changes for trust boundaries async refresh and support for self-signed JWT
vverman
committed

Commits on Jan 17, 2026

Fixed unit tests moved RAB logic out of authclient.
vverman
committed
Changed getRegionalAccessBoundaryUrl and fixed a self-signed jwt failure.
vverman
committed

Commits on Jan 20, 2026

Fixed url for service account RAB lookup.
vverman
committed

Commits on Jan 28, 2026

Formatting and minor fixes
vverman
committed

Commits on Jan 29, 2026

Stale RAB retry now has its own flag. RAB refresh now triggered at the requestAsync level. RAB urls now have googleapis as universe domain.
vverman
committed

Commits on Jan 30, 2026