build: mark bisync golden test files as generated

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Before this change, GitHub showed the bisync golden test files
(`cmd/bisync/testdata/*/golden/`) in full in pull request diffs, where a
new test scenario can add hundreds of lines of expected output.

After this change, they are marked `linguist-generated`, like `MANUAL.*`
and `rclone.1`, so GitHub collapses them in diffs and leaves them out of
the language statistics. They are still one click away in a diff.

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