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test:migrate `doc/directory/docscrape` to snapbox ### What does this PR try to resolve? Complete the following file migration: ``` tests/testsuite/directory.rs tests/testsuite/doc.rs tests/testsuite/docscrape.rs ``` part of #14039
WARNING: You might not want to use this outside of Cargo.
- This is designed for testing Cargo itself. Use at your own risk.
- No guarantee on any stability across versions.
- No feature request would be accepted unless proved useful for testing Cargo.