Add data node version mismatch system notification

[moesterheld]

Description

This adds a system notification if Graylog server and one of the connected Data Nodes' version do not match.

Motivation and Context

resolves #21701

How Has This Been Tested?

added unit tests

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (non-breaking change)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.