Adds blkinfo for use by stormond to instantiate UsbUtil object (#20053)

Why I did it
This module is required in the pmon container for Storage Monitoring Daemon (stormond) to instantiate objects of type (UsbUtil)[sonic-net/sonic-platform-common#493].

Work item tracking
Microsoft ADO (number only): 29203991

How I did it
Added config to pmon Dockerfile.j2 to install blkinfo

How to verify it
On an image containing this change, verify following output:

root@str2-7050qx-32s-acs-03:/# pip3 list | grep -i blkinfo
blkinfo                       0.2.0

dockers/docker-platform-monitor/Dockerfile.j2

@@ -54,6 +54,10 @@ RUN pip3 install libpci
 # Install psutil for process and system monitoring operations
 RUN pip3 install psutil
 
+# Install blkinfo for block device information gathering operations
+RUN pip3 install blkinfo
+
+
 {% if docker_platform_monitor_debs.strip() -%}
 # Copy locally-built Debian package dependencies
 {{ copy_files("debs/", docker_platform_monitor_debs.split(' '), "/debs/") }}