Fix Jest workspace package resolution to enable tests without build step

[Copilot]

Tests failed when run before building because Jest couldn't resolve workspace package imports (@objectql/types, @objectql/driver-remote, etc.) to their TypeScript source files.

Changes

• Added moduleNameMapper to map workspace packages to source: '^@objectql/(.*)$': '<rootDir>/../$1/src'
• Enabled isolatedModules in ts-jest to compile files without cross-package type checking
• Updated 3 packages: core, driver-knex, driver-mongo to match pattern already used in server

// packages/core/jest.config.js
module.exports = {
  preset: 'ts-jest',
  testEnvironment: 'node',
  moduleNameMapper: {
    '^@objectql/(.*)$': '<rootDir>/../$1/src',
  },
  transform: {
    '^.+\\.ts$': ['ts-jest', { isolatedModules: true }],
  },
};

This enables pnpm test to run directly without pnpm build, improving test iteration speed.

Original prompt

pnpm test failed

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