fix: exclude system messages from eager fetching

[sussycatgirl]

Please make sure to check the following tasks before opening and submitting a PR

• [X] I understand and have followed the contribution guide
• [X] I have tested my changes locally and they are working as intended
• [X] These changes do not have any notable side effects on other Revolt projects

I'm tired of the constant Axios stack traces

[sussycatgirl]

I run prettier, it messes up the imports I don't run prettier, it messes up the CI :wires: