feat(tests): overhaul staging test infrastructure and update fixtures#1392

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tychtjan wants to merge 3 commits intomasterfrom

tests_rewrite_staging

Commits on Mar 5, 2026

fix(tests): overhaul staging test infrastructure and update fixtures
tychtjan
committed

Commits on Mar 6, 2026

feat(ci): add staging test workflow and harden staging infrastructure
tychtjan
committed
fix(tests): add alternativeDataSourceId to data source fixture
tychtjan
committed