Move args into command and add neuron-monitor-blocker volume

[phooq]

Issue #, if available:

1. The current way to pass args via NeuronMonitor crd is problematic. It will causes the neuron-monitor daemonset pod to be immediately terminated after launch, recreated, and then go through a couple of these cycles before finally reaching a RUNNING state.

   args:
       port: "{{ .Values.neuronMonitor.service.port }}"
       cert-file: "/etc/amazon-cloudwatch-observability-neuron-cert/server.crt"
       key-file: "/etc/amazon-cloudwatch-observability-neuron-cert/server.key"
   

2. Update the neuron-monitor pod image from version 1.6.0 to 1.7.0. Note that neuron-monitor 1.7.0 has NOT been released yet, so pls don't merge this PR until it is released

3. Add neuron-monitor-blocker volume as an additional readonly volume mount in the neuron-monitor pod.

Description of changes:

1. neuron-monitor daemonset manifest :
   Removed args field and merged it to a unified command field with all the args

2. Updated the neuron-monitor version tag from 1.6.0 to 1.7.0

3. Add the neuron-monitor-blocker volume and volume mount

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