chore: exclude vortex-error from coverage report (#4366)

it is small & useless to generate coverage for (everything we care about
is covered by the compiler)

Signed-off-by: Will Manning <[email protected]>

Author: lwwmanning

.github/workflows/ci.yml

@@ -316,7 +316,7 @@ jobs:
           rustup component add llvm-tools-preview
           grcov . --binary-path target/debug/ -s . -t lcov --llvm --ignore-not-existing \
             --ignore '../*' --ignore '/*' --ignore 'fuzz/*' --ignore 'bench-vortex/*' \
-            --ignore 'home/*' --ignore 'xtask/*' --ignore 'target/*'\
+            --ignore 'home/*' --ignore 'xtask/*' --ignore 'target/*' --ignore 'vortex-error/*' \
             --ignore 'vortex-python/*' --ignore 'vortex-jni/*' --ignore 'vortex-flatbuffers/*' \
             --ignore 'vortex-proto/*' --ignore 'vortex-tui/*' --ignore 'vortex-datafusion/examples/*' \
             --ignore 'vortex-ffi/examples/*' --ignore '*/arbitrary/*' --ignore '*/arbitrary.rs' --ignore 'vortex-cxx/*' \