Observers clear references

[anaice]

Type of PR

Bug fix

Description

Process level (CableReady::Config - @observer_peers) channel clearing.

Fixes #297

Why should this be added

Possible memory leak fix

Checklist

• [x] My code follows the style guidelines of this project
• [x] Checks (StandardRB & Prettier-Standard) are passing

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[marcoroth]

@hopsoft any chance you can give this a look too?