fix(go): auth in wire tests, seed test failures on main

[patrickthornton]

Description

The fixtures exhaustive/omit-empty-request-wrappers and go-deterministic-ordering were failing on main because of a stale generation; this fixes that, plus adds an extra prophylactic change to WireTestGenerator.ts wherein actual auth options get generated when endpoint.auth is true.

Testing

Tested that those two Go fixtures are indeed consistently failing on recent main runs (appears to have stemmed from here #14411, a PR that changed a shared util packages/commons/mock-utils/index.ts but didn't regenerate Go seed fixtures; and tested that this change fixes that.

• Unit tests added/updated
• Manual testing completed

[claude]

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[github-actions]

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SDK Generation Benchmark Results

Comparing PR branch against latest nightly baseline on main (2026-04-08T04:49:09Z).

Full benchmark table (click to expand)

Generator	Spec	main (generator)	main (E2E)	PR (generator)	Delta
go-sdk	square	280s	345s	294s	+14s (+5.0%)

main (generator): generator-only time via --skip-scripts (includes Docker image build, container startup, IR parsing, and code generation — this is the same Docker-based flow customers use via fern generate). main (E2E): full customer-observable time including build/test scripts (nightly baseline, informational). Delta is computed against generator-only baseline.
⚠️ = generation exited with a non-zero exit code (timing may not reflect a successful run).
Baseline from nightly runs on main (latest: 2026-04-08T04:49:09Z). Trigger benchmark-baseline to refresh.