[docker-platform-monitor] Check if sonic_platform package is available before checking if installed #5764
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- Why I did it
On Arista platforms, sonic_platform packages are not installed in the PMon container, but are rather mounted into the container from the host OS. Therefore,
pip show sonic_platform
will fail in the PMon container. This change will first check if we can import sonic_platform. If this fails, it will then fall back to checking if the package is installed. If both fail, it will attempt to install the package.