fix(jest-mock): support promise helpers on overloaded mocks

[rohan-patnaik]

Fixes #16174

Summary

This fixes jest-mock promise helper types for overloaded functions where one overload returns a promise and another returns a non-promise value.

Why

Before this change, helpers like mockResolvedValue, mockRejectedValue, and mockReturnValue used ReturnType<T>. For overloaded functions, TypeScript can collapse that to the callback-style overload, which makes valid promise mocks type as never or void.

Test plan

• corepack yarn build:ts
• corepack yarn tstyche packages/jest-mock/__typetests__/Mocked.test.ts
• corepack yarn eslint --cache packages/jest-mock/src/index.ts packages/jest-mock/__typetests__/Mocked.test.ts
• corepack yarn prettier --check packages/jest-mock/src/index.ts packages/jest-mock/__typetests__/Mocked.test.ts

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• ✅ login: rohan-patnaik / name: Rohan Patnaik (3242efd, 94398c5)

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commit: 64075dd