Do not detect file names starting `..` as having up-level references. `PathFragment::containsUplevelReferences` detects whether a path has an up-level reference (`..`). The logic looks at the beginning of the normalized path whether it starts with a `..`. This is incorrect for path segments which have a `..` prefix, but are not `..`, e.g. `..file`. This causes bazel to crash when we create a tree artifact with a file starting with a `..`. Fix the detection to only recognize paths with `..` segments. PiperOrigin-RevId: 351624019
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