chore: Removal of note observer

[BenedictHomuth]

Description

This PR removes only the observers for notes. It is meant for a proof of concept before removing the remaining observers.

In order to test, I needed to mock the real-time broker (which includes its client aka. the con field).
Before I could not create a Mock-Broker, since the "con" field was not exported. With the changes at hand, I now export the "Con" field, which makes it possible to mock out the broker ultimately leading to running tests 🙂.

Changelog

• Removed the note observers
• Moved the observer logic inside the service layer
• Made the general code work with those changes
• Exported the Con field of real-time broker in order to be able to mock the real-time package
• Adapted tests to run without observers

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• The light- and dark-theme are both supported and tested
• The design was implemented and is responsive for all devices and screen sizes
• The application was tested in the most commonly used browsers (e.g. Chrome, Firefox, Safari)

(Optional) Visual Changes

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[mateo-ivc]

lgtm

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