chore: add generated files to .gitattributes

[dlarocque]

Adds paths to generated files to gitattributes. This will eliminate noise from generated files in PR diffs.

"Use the linguist-generated attribute to mark or unmark paths that you would like to be ignored for the repository's language statistics and hidden by default in diffs." https://docs.github.com/en/repositories/working-with-files/managing-files/customizing-how-changed-files-appear-on-github

[changeset-bot]

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Latest commit: f8297c8

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[gemini-code-assist]

Code Review

This pull request updates the .gitattributes file to mark generated and snapshot files, including API review markdown files, prune-dts test declaration files, and the yarn.lock file, as linguist-generated=true. This ensures these files are collapsed by default in GitHub pull requests to improve review readability. There are no review comments, and I have no additional feedback to provide.