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
- [x] Make sure you are opening from a topic branch (**/feature/fix/docs/ branch** (right side)) and not your main branch.
- [x] Ensure that the pull request title represents the desired changelog entry.
- [x] New public fields and methods are annotated with `@since TODO`.
- [x] I read and followed the [contribution guidelines](https://github.com/IntellectualSites/.github/blob/main/CONTRIBUTING.md).