Document that a failed download may leave a partial file (#31837) ### Description Documents on the `allow_fail` parameter of `repository_ctx.download` and `module_ctx.download` that a failed download may leave a partially downloaded file at the output path, or one that doesn't match `sha256` or `integrity`. ### Motivation Deleting the output of a failed download instead would break rules that resume it, e.g. with a `Range` header in `headers`, and would also delete a file that was at the output path before the download. ### Build API Changes No ### Release Notes RELNOTES: None Closes #31837 COPYBARA_INTEGRATE_REVIEW=https://github.com/bazelbuild/bazel/pull/31837 from fmeum:download-cleanup-partial-output 6fbd98d48e8dbd07172fa6757afa760dc22e0aed PiperOrigin-RevId: 1007401272 Change-Id: I764008f7e677d7fe6543ad341908ea6f41c8ea26
{Fast, Correct} - Choose two
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