(autofix): fix diff applying bug

[aayush-se]

Line 74 in this diff shouldn't be here

Langfuse trace to see what the raw diff is

[trillville]

example complaint https://sentry.sentry.io/feedback/?referrer=slack&notification_uuid=e0be0d10-1023-438a-adbf-12ecfb94dad7&alert_rule_id=15433082&alert_type=issue&feedbackSlug=javascript%3A6350134260&project=11276

[roaga]

Example PR: 6e798d8

I think it has something to do with find_original_snippet being incorrect sometimes.

But if we're doing full file edits, can we just skip all this complexity? GitHub just needs the old file and the new file.