chore: [NPM] Updated NPM to Not Use Privileged containers and to Mount Container's Root Filesystem as Read Only

[rayaisaiah]

Reason for Change:

Addresses NPM Linux vulnerabilities from security scan by customer.

Issue Fixed:

• Do not use privileged containers
  • set securityContext.privileged=false
  • Added NET_ADMIN capabilities securityContext.capabilities.add=- NET_ADMIN as netadmin profile is able to view/modify iptables rules without privilege
• Mount container's root filesystem as read only
  • set securityContext.readOnlyRootFilesystem=true
  • Mounted an emptyDir volume on the mount /tmp instead of writing to the root volume as we need to write for app insights telemetry

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• relevant PR labels added