Stanisław Chmiela 952b275c90 [chore] Revamp testing (#3375) ...

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# Why

We moved more packages into this monorepo and the existing test setup didn’t scale well:
- the root Jest config only covered a subset of packages,
- PRs ran heavier “all tests” workflows,
- worker builds ran on PRs even though typecheck + tests were enough.

This PR aligns testing with the dependency graph, reduces unnecessary CI work, and standardizes Jest config handling.

# How

- Switched root testing to Lerna and updated docs.
- CI now runs affected+dependent tests on PRs and all packages on main.
- Coverage runs via Lerna with per-package reports (no merge) and is kept for PRs.
- Worker builds are skipped on PRs; worker workflow triggers include dependency paths on main.
- All Jest configs are now TypeScript with a shared base (`jest/jest.shared.config.ts`) and use `@jest/types` to avoid TS config parsing errors.
- CI stays unit-only (no integration tests).

# Test Plan

Not run locally. CI covers:
- `yarn lerna run test` (affected on PRs, all on main)
- `yarn lerna run test -- --coverage`

2026-02-04 21:34:56 +01:00

..

jest.shared.config.ts

[chore] Revamp testing (#3375)

2026-02-04 21:34:56 +01:00