chore(docs): clarify that nodes running VMs should not have any taints

[z9r5]

Description

Updated the user documentation to clarify the recommendations regarding node taints for running virtual machines.

Changelog entries

section: core
type: docs
summary: Updated the user documentation to clarify the recommendations regarding node taints for running virtual machines. 

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR updates the USER_GUIDE in both English and Russian to explicitly state that nodes running virtual machines should not have any taints.

File-Level Changes

Change	Details	Files
Clarify that VM-hosting nodes must be taint-free	Replace generic ‘consider existing taints’ bullet with explicit ‘no taints’ guidance in English documentation Apply equivalent change in Russian documentation	docs/USER_GUIDE.md docs/USER_GUIDE.ru.md

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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[fl64]

This is not a completely correct statement, VMs have tolerations to run on nodes with taints.