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

[octomind-dev[bot]]

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Test Report: 0/13 successful.

description	status	details
change avatar	Failed ❌	click
check Privacy Policy	Failed ❌	click
check terms & conditions	Failed ❌	click
close cookie banner - front page	Failed ❌	click
close cookie banner - sign-in	Failed ❌	click
create and delete board columns	Failed ❌	click
create_and_delete_notes_and_actions_v2	Failed ❌	click
create lean coffee board	Failed ❌	click
edit_notes_and_actions_v5	Failed ❌	click
get started	Failed ❌	click
share_session	Failed ❌	click
sign-in	Failed ❌	click
test all ways to open the setup flow	Failed ❌	click

commit sha: 97a849d

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Test Report: 14/14 successful.

description	status	details
About Section Visibility Test	Passed ✅	click
change avatar	Passed ✅	click
check Privacy Policy	Passed ✅	click
check terms & conditions	Passed ✅	click
close cookie banner - front page	Passed ✅	click
close cookie banner - sign-in	Passed ✅	click
create and delete board columns	Passed ✅	click
create_and_delete_notes_and_actions_v2	Passed ✅	click
create lean coffee board	Passed ✅	click
edit_notes_and_actions_v5	Passed ✅	click
get started	Passed ✅	click
share_session	Passed ✅	click
sign-in	Passed ✅	click
test all ways to open the setup flow	Passed ✅	click

commit sha: efe14f6