Force-enable NETWORK side effect to ensure blocks are instantly visible

[SirYwell]

Overview

Description

Fixes an issue where block changes depending on WNA weren't visible. This is initially caused by FAWE as it changes the NETWORK default to OFF. By just re-enabling it, we can restore the previous behavior.
As the NETWORK side effect is WE 7.3+, we fall back to ignoring it if not present.

Submitter Checklist

Preview Give feedback

1. Make sure you are opening from a topic branch (/feature/fix/docs/ branch (right side)) and not your main branch.
2. Ensure that the pull request title represents the desired changelog entry.
3. New public fields and methods are annotated with @since TODO.
4. I read and followed the contribution guidelines.