begin refactoring ValLineError collection
          #1517
        
          
      
                
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Change Summary
Motivated by #1512.
Our error handling code is getting complicated at each callsite. This begins an attempt to refactor it to move repetition into common code, by adding a
.collect_line_errors()helper to takeLineErrorsand collect them up.This only touches a few of the many code paths which collect line errors; they have a variety of different ways to build up locations. If we think we want to proceed with this, I'll follow up with further refactorings another day.
Related issue number
N/A
Checklist
pydantic-core(except for expected changes)