Handle long log lines from scrapers and plugins

[Maista6969]

Description

This changes the logging infrastructure used by scrapers and plugins to handle log lines that exceed 64KB by replacing the bufio.Scanner with a bufio.Reader that reads their stderr in chunks. I could have raised the buffer size on the bufio.Scanner but that would just be moving the breakpoint instead of fixing the core issue.

Related Issue

Resolves #7170

Testing

I have added a small test that exercises the fix and there is no change in behavior that scrapers or plugins need to be aware of.

Checklist

• I have read and understood the Contributing document.
• I have read and understood the AI Usage Policy document.
• I have made corresponding changes to the documentation (if applicable).

AI Usage Disclosure

• I have used AI tools to assist with this pull request, and I have disclosed the tools and how I used them below.