[CI] Fix Monolithic Linux Build in Ubuntu 24.04

This patch fixes the monolithic linux build in Ubuntu 24.04. Newer
versions of debian/ubuntu pass a warning when installing packages at the
system level using pip as it interferes with system package manager
installed python packages. We do not use any, so we just ignore the
warning (that is an error without passing the flag) by passing the
--break-system-packages flag.

Author: boomanaiden154

.ci/monolithic-linux.sh

@@ -53,9 +53,9 @@ targets="${2}"
 lit_args="-v --xunit-xml-output ${BUILD_DIR}/test-results.xml --use-unique-output-file-name --timeout=1200 --time-tests"
 
 echo "--- cmake"
-pip install -q -r "${MONOREPO_ROOT}"/mlir/python/requirements.txt
-pip install -q -r "${MONOREPO_ROOT}"/lldb/test/requirements.txt
-pip install -q -r "${MONOREPO_ROOT}"/.ci/requirements.txt
+pip install --break-system-packages -q -r "${MONOREPO_ROOT}"/mlir/python/requirements.txt
+pip install --break-system-packages -q -r "${MONOREPO_ROOT}"/lldb/test/requirements.txt
+pip install --break-system-packages -q -r "${MONOREPO_ROOT}"/.ci/requirements.txt
 cmake -S "${MONOREPO_ROOT}"/llvm -B "${BUILD_DIR}" \
       -D LLVM_ENABLE_PROJECTS="${projects}" \
       -G Ninja \