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Remove null characters from diff strings

Carla Drago requested to merge 422912-sanitize-diffs into master

What does this MR do and why?

This change removes null characters from diff strings during import so that these strings can be saved to the database. At the moment, because the diff column on the MergeRequestDiffFile record is text type. Postgres doesn't allow null characters on this type.

Changelog: fixed

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Related to #422912 (closed)

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