feat: improve browser service

[cygaar]

Relates to:

Performance and security improvements with the browser service.

Risks

Low since the browser performance was already inconsistent

Background

What does this PR do?

There are several changes I made to the browser service to make it better:

• More accurate and up to date user agent to reduce bot detection
• Remove redundant content summarization
• Remove queuing system since all fetches are blocking and it was leading to duplicate pages being loaded
• Run in headless mode to reduce cpu usage and latency
• Re-enable sandbox mode to isolate malicious browser behavior
• Prevent unwanted downloads of files

What kind of change is this?

Improvements

Documentation changes needed?

None

Testing

Where should a reviewer start?

Test by sending urls on discord

Detailed testing steps

[lalalune]

v smort