chore: refactor extensions build script for optimization

[louis-jan]

Describe Your Changes

This PR aims to refactor all the extensions bundlers. We've replaced webpack and rollup with rolldown, which is incredibly fast and already supports built-in plugins. This change will significantly reduce development and CI build times.

<DIR>/dist/index.js  chunk │ size: 61.16 kB
✔ Finished in 8.83 ms

<DIR>/dist/index.js  chunk │ size: 153.88 kB
<DIR>/dist/node/index.cjs.js  chunk │ size: 4.63 kB
✔ Finished in 12.36 ms

Reduced 1m / os / job

Fixes Issues

• Closes #
• Closes #

Self Checklist

This pull request includes several changes aimed at migrating the build system from Webpack and Rollup to Rolldown across multiple extensions. Additionally, it introduces some environment variable handling and updates TypeScript configurations. Here are the most important changes:

Build System Migration:

• extensions/assistant-extension/package.json: Replaced Webpack and Rollup with Rolldown for the build process and added new dependencies for Rolldown. [1] [2]
• extensions/assistant-extension/rolldown.config.mjs: Added new Rolldown configuration file to replace Rollup configuration.
• extensions/assistant-extension/rollup.config.ts: Removed the old Rollup configuration file.
• extensions/conversational-extension/package.json: Replaced Webpack with Rolldown for the build process and added new dependencies for Rolldown. [1] [2]
• extensions/conversational-extension/rolldown.config.mjs: Added new Rolldown configuration file.
• extensions/conversational-extension/webpack.config.js: Removed the old Webpack configuration file.
• extensions/engine-management-extension/package.json: Replaced Webpack with Rolldown and updated dependencies.
• extensions/engine-management-extension/rolldown.config.mjs: Updated to use Rolldown and removed unnecessary plugin. [1] [2] [3]
• extensions/inference-anthropic-extension/package.json: Replaced Webpack with Rolldown and updated dependencies.
• extensions/inference-anthropic-extension/rolldown.config.mjs: Added new Rolldown configuration file.
• extensions/inference-anthropic-extension/webpack.config.js: Removed the old Webpack configuration file.
• extensions/inference-cohere-extension/package.json: Replaced Webpack with Rolldown and updated dependencies. [1] [2]
• extensions/inference-cohere-extension/rolldown.config.mjs: Added new Rolldown configuration file.
• extensions/inference-cohere-extension/webpack.config.js: Removed the old Webpack configuration file.
• extensions/inference-cortex-extension/package.json: Replaced Rollup with Rolldown for the build process.

Environment Variable Handling:

• .github/workflows/jan-electron-linter-and-test.yml: Added a step to set the IS_TEST environment variable.
• extensions/assistant-extension/package.json: Modified the build-universal-hnswlib script to skip the universal build if IS_TEST is set to true.

TypeScript Configuration Updates:

• extensions/assistant-extension/tsconfig.json: Updated TypeScript configuration to change module and target settings, and adjusted strictness.

Code Cleanup:

• extensions/assistant-extension/src/node/index.ts: Removed unused import.
• extensions/inference-anthropic-extension/src/index.ts: Removed unused declared constants.
• extensions/inference-cohere-extension/src/index.ts: Removed unused declared constants.

[github-actions]

Barecheck - Code coverage report

Total: 68.61%

Your code coverage diff: 0.00% ▴

✅ All code changes are covered

[github-actions]

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