Output list instead of table

[fregante]

• Fixes Output as list, not table #5423

Before

This isn't even the full table, it doesn't fit on my screen

After

[fregante]

@willdurand @rpl This code is straight out of Claude. We can bikeshed the output but I think it's a vast improvement already.

Codebase cleanup and tests update will follow after approval

[willdurand]

It would have been good to discuss in #5423 first. I don't really have a strong opinion on the current linter output but - at the same time - this works relatively well and that isn't necessarily an area where I'd change code, but that's my personal opinion on this.

[fregante]

I opened a PR right after the issue in order to demo the output and changes required. It's always easier to discuss things when there's an exact desired output, especially in a project that evolves very slowly.

[fregante]

@rpl @willdurand I believe the improvements here are evident from my screenshots:

• the output is shorter
• there's no duplicate explanation
  
• there's no bad wrapping of long text
  
• paths are always clickable
  
• row and col are part of the path, meaning IDEs can reach them in the same click
  
• the table implementation isn't even right because the error/warning tables are not aligned
  

The only reason not to move forward with this is because it already works, albeit in this suboptimal fashion. Since I'm currently available to work on this, allow me to complete this change and merge this PR. I don’t really like keeping PRs open for years