chore: make the monitors consistently log using this.name where appropriate

[CommanderStorm]

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📝 Summary of changes done and why they are done

This PR changes the monitors to more conistently log who they are.

[Copilot]

Pull request overview

This PR standardizes monitor logging to use this.name instead of hardcoded strings, improving consistency across monitor types. Additionally, it removes debug code and refactors Chromium installation logic.

Key changes:

• Replaced hardcoded log module names with this.name reference for SNMP, PostgreSQL, and MQTT monitors
• Removed a debug console.log statement
• Extracted Chromium installation into a separate well-documented function

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
server/monitor-types/snmp.js	Changed log.debug to use this.name instead of hardcoded "monitor" string
server/monitor-types/real-browser-monitor-type.js	Removed debug console.log, changed log.debug calls to use "chromium", and refactored Chromium installation into a separate function
server/monitor-types/postgres.js	Changed log.debug to use this.name instead of hardcoded "postgres" string
server/monitor-types/mqtt.js	Changed all log.debug calls to use this.name instead of hardcoded "mqtt" string