feat: Add support for running Chrome in Headless mode.

[ickma]

Add headless mode support for Chrome

Background

To enable Chrome headless support and make it runnable on the server. Currently, our Selenium script has no headless mode, which is causing issues on server

Changes

• Adds a new configuration parameter headless_browser that can be set in the environment configuration file.
• If headless_browser is set to true, this updates Selenium to launch the browser in headless mode with the appropriate options.
• Updates the env template to include the new headless_browser parameter.

Documentation

Test Plan

PR Quality Checklist

• My pull request is atomic and focuses on a single change.
• I have thoroughly tested my changes with multiple different prompts.
• I have considered potential risks and mitigations for my changes.
• I have documented my changes clearly and comprehensively.
• I have not snuck in any "extra" small tweaks changes

[mrjdomingus]

To prevent the "DevToolsActivePort file doesn't exist" error, you may also want to add this option in web.py:
options.add_argument('--disable-dev-shm-usage')
according to https://stackoverflow.com/questions/50642308/webdriverexception-unknown-error-devtoolsactiveport-file-doesnt-exist-while-t

[nponeccop]

@ickma There are conflicts now

[github-actions]

This pull request has conflicts with the base branch, please resolve those so we can evaluate the pull request.

[github-actions]

Conflicts have been resolved! 🎉 A maintainer will review the pull request shortly.

[Pwuts]

Seems to work on both Windows and Linux