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Search backend: add diff formatting function

Administrator requested to merge cc/structured-diffs into main

Created by: camdencheek

Adds a formatting function to invert ParseDiffString. I'd like to save the structured form of diff on the result type, but I want to be able to easily get the original format back.

Stacked on https://github.com/sourcegraph/sourcegraph/pull/39378

Test plan

Added an assertion that round-trip reformatting works as expected.

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