Update list of diffable files

[zachmargolis]

In #10518 we added .gitattributes

However, treating yarn.lock as a binary file has challenged my local workflow, so I can't add files incrementally with git add --patch (git add -p), they get skipped

This came up when I was working on #10854

Before

> git status
...
Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
	modified:   yarn.lock

> git add -p
Only binary files changed.

After

(I can update yarn.lock via git add -p)

[n1zyy]

I tripped over this trying to look at your PR, too: #10854 (comment)

The spirit of .gitattributes is great, but I agree that these should be made to show diffs.