chore(deps-dev): migrate to Jest 30

[pmigueld]

Migrates all 5 Jest packages (datacollect, backend, adapter-mock/openfn/openspp) to Jest 30 (supersedes dependabot #73 and #89). A migration, not a plain bump.

Changes

• jest ^29.7.0→^30.0.0, @types/jest ^29.5.14→^30.0.0 (all 5); jest-environment-jsdom→^30.0.0 (datacollect). ts-jest kept at ^29.4.11 (supports jest 30).
• Removed the abandoned jest-fetch-mock (breaks on jest 30's native fetch) from all 5 configs + package.json. No fetch-mock code changes needed: its global was never actually enabled (enableMocks() was never called), and the two fetch-touching datacollect tests already use jest-native global.fetch = jest.fn().

Fallout from jest-30/jsdom-30 (assertions preserved)

• jsdom 30 makes window a non-configurable getter → the Auth0/Keycloak adapter tests (which fake global.window to test frontend/backend detection, no real DOM) moved to @jest-environment node + configurable: true. Same assertions.
• expect@30 toThrow now enforces the thrown error's class. EntityDataManager.test.ts expected an AppError that the code never actually throws — EventApplierService throws a plain Error and EntityDataManager.submitForm passes it through unwrapped (verified: no SUBMIT_FORM_ERROR exists in the codebase). Corrected the expectation to new Error(<same message>), preserving the message check jest 29 performed.

Verification

datacollect 857 (801 pass/56 skip), backend 421 (vs Postgres), adapter-openspp 140, adapter-openfn 27, adapter-mock 53 — all match baseline.

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