refactor: remove setup-jest files

[ahnpnl]

Test plan

Green CI

Does this PR introduce a breaking change?

• Yes
• No

• Use setupZoneTestEnv as a replacement for zone test environment setup
• Use setupZonelessTestEnv as a replacement for zoneless test environment setup

Other information

N.A.

PR Overview

This PR refactors the test environment setup by removing the deprecated setup-jest files and updating tests to use the new setupZoneTestEnv functions. Key changes include:

• Removal of references to setup-jest.js/mjs from asset lists and test imports.
• Updated tests in setup-jest.spec.ts to verify configuration using setupZoneTestEnv.
• Complete deletion of the deprecated setup-jest.js and setup-jest.mjs files.

Reviewed Changes

File	Description
scripts/test-examples.js	Removed legacy setup-jest asset names from the file copy operations.
src/config/setup-jest.spec.ts	Removed tests for legacy setup-jest initialization and retained tests for setupZoneTestEnv.
setup-jest.mjs, setup-jest.js	Deprecated setup files have been removed.

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (1)

src/config/setup-jest.spec.ts:109

• [nitpick] The describe block title still references 'setup-jest' despite the switch to setupZoneTestEnv in tests. Consider updating the title to accurately reflect the new test environment setup for clarity.

describe('for ESM setup-jest, test environment initialization', () => {

PR Overview

This PR removes deprecated setup-jest files and updates test configuration to use the new test environment setup utilities (setupZoneTestEnv and setupZonelessTestEnv).

• Removed deprecated asset references and files for setup-jest.
• Updated test specs to import and use setupZoneTestEnv for both CJS and ESM environments.

Reviewed Changes

File	Description
scripts/test-examples.js	Removed deprecated setup-jest file paths from the asset list.
src/config/setup-env.spec.ts	Updated test descriptions and import statements to use setupZoneTestEnv.
setup-jest.mjs	Removed the deprecated setup file.
setup-jest.js	Removed the deprecated setup file.

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (2)

src/config/setup-env.spec.ts:66

• Verify that removing the cleanup of globalThis.ngJest is intentional, as its persistence between tests could lead to state leakage.

delete globalThis.ngJest;

src/config/setup-env.spec.ts:111

• Consider adding test coverage for the setupZonelessTestEnv function to ensure that both new test environments are properly validated.

describe('for ESM, test environment initialization', () => {