Make the dashboards plugins stateless

[asteriscos]

Description

We have to turn the Wazuh dashboard to be stateless. This involves refactoring features that create or make use of a file. The main goal of this epic is to be able to deploy a Wazuh dashboard container without requiring external volumes.

Functional requirements

• As a Wazuh administrator I want to be able to deploy a Wazuh dashboard container without requiring external volumes.

Non-functional requirements

• Create predefined PDF reports of the different dashboards using the upstream reporting plugin.
• Configure the Wazuh dashboard's app settings in a Saved Object instead of the wazuh.yml file.
• The Wazuh dashboard's log should be written in the output of the process console instead of a file.

Implementation restrictions

• None of the mentioned features can create or modify a file in the dashboard container
• We must take into consideration the migration process from previous versions:
  • Eg. Allow the user to access previously created PDF reports
  • Eg. Migrate the wazuh.yml configuration file to a saved object

Plan

• Identify all the state sources in the dashboards #6136
• Adapt the logging method of the plugins to the provided by the platform #6137
• Remove the ablity to store the PDF reports into the filesystem #6487
• Move the plugin configuration to stateless #6201
  • After further analysis we decided to persis the configuration in the wazuh.yml configuration file and add a new feature to disable the access to the configuration using a setting. This will be done in the following issue
  • Disable settings with wazuh.yml configuration #6557
• Rollback the system to save the configuration to configuration file #6570
• Move the plugin registry to stateless #6387