fix(backfill): correct variable name in error handler

[tharropoulos]

TLDR

Fixed naming conflict between 'error' variable and error logging function in catch block.

Change Summary

Code Changes:

1. In functions/src/backfill.js:
   • Renamed error variable to err in catch block (line 95) to avoid collision with the error logging function
   • Updated subsequent references to use err instead of error (lines 96-98)

Context

• The backfill function was using the same name (error) for both the caught exception variable and the error logging function, which could lead to confusion and potential issues
• This fix ensures proper error handling and logging in the Typesense document import process

PR Checklist

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