use scons to build panda fw (#20457)

* use scons to build panda fw

* add arm gcc to dockerfile

* install gcc on macOS

* pandad shutdown test is flaky and broken due to faster startup

* bump panda
old-commit-hash: 0e338d2b91

Dockerfile.openpilot_base

@@ -14,6 +14,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     cppcheck \
     curl \
     ffmpeg \
+    gcc-arm-none-eabi \
     git \
     iputils-ping \
     libarchive-dev \