MLE-24682 network filtering fix

[vitalykorolev]

add 'modprobe br_netfilter' command to ensure that netfiltering works

[Copilot]

Pull Request Overview

This PR fixes network filtering issues by ensuring the br_netfilter kernel module is loaded before configuring bridge traffic filtering. The change adds a modprobe command to load the required kernel module that enables netfiltering functionality for bridge traffic.

• Adds kernel module loading to ensure br_netfilter is available before configuration

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