improvement: Removal of observers

[BenedictHomuth]

Description

This PR removes all currently used observers. The logic is moved back inside the corresponding service packages.

The column observer is left out, since it is covered in (https://github.com/inovex/scrumlr.io/pull/3400)

Changelog

Removed all observer and corresponding test files.

After every qualified DB transaction, the websocket messages are now published in an asynchronous go-routine.

Checklist

• [x] I have performed a self-review of my own code
• [x] 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
• [x] The application was tested in the most commonly used browsers (e.g. Chrome, Firefox, Safari)

[octomind-dev[bot]]

🐙 Octomind

Test Report: 6/9 successful.

description	status	details
change avatar	Passed ✅	click
sign-in	Passed ✅	click
edit_notes_and_actions_v5	Failed ❌	click
share_session	Passed ✅	click
sign-in with Google - incomplete test	Passed ✅	click
create_and_delete_notes_and_actions_v2	Failed ❌	click
create lean coffee board	Passed ✅	click
test all ways to open the setup flow	Passed ✅	click
create and delete board columns	Failed ❌	click

commit sha: 90f540f

[github-actions[bot]]

The deployment to the dev cluster was successful. You can find the deployment here: https://3458.development.scrumlr.fra.ics.inovex.io This deployment is only for testing purposes and will be deleted after 1 week. To redeploy rerun the workflow. DO NOT STORE IMPORTANT DATA ON THIS DEPLOYMENT

Deployed Images

• ghcr.io/inovex/scrumlr.io/scrumlr-frontend:sha-c4a8988

• ghcr.io/inovex/scrumlr.io/scrumlr-server:sha-c4a8988

[octomind-dev[bot]]

🐙 Octomind

Test Report: 6/9 successful.

description	status	details
change avatar	Passed ✅	click
sign-in	Passed ✅	click
edit_notes_and_actions_v5	Failed ❌	click
share_session	Passed ✅	click
sign-in with Google - incomplete test	Passed ✅	click
create_and_delete_notes_and_actions_v2	Failed ❌	click
create lean coffee board	Passed ✅	click
test all ways to open the setup flow	Passed ✅	click
create and delete board columns	Failed ❌	click

commit sha: c4a8988