Fix coverage for crates with mixed sources#4079
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Crates with generated sources are compiled from the output tree, so their coverage mapping records bazel-out/... paths, which Bazel's lcov merger silently drops. Remap the prefix away so coverage paths come out workspace-relative.
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Crates with generated sources are compiled from the output tree, so their coverage mapping records bazel-out/... paths, which Bazel's lcov merger silently drops. Remap the prefix away so coverage paths come out workspace-relative.
I'm not 100% confident this is the correct fix, but it fixes the coverage for us in crates that has both in-tree and generated src files.