[Feat]: Notification setting logic updates

[Ayush8923]

closes: #2723

Visible/Frontend Changes

• Implement the logic to save the notification rules in CouchDB
• Implement the logic that when the user enables or disables push notifications from the Where you receive notifications section in the notification settings page, the value is updated accordingly in the CouchDB.
• Retrieve the existing notification rules from the CouchDB and then show all the notification rules.

[sleidig]

I did a fairly major further refactoring to simplify the layers of formControls and methods. Please have a look at the latest code and check if you find any errors or have further suggestions, @Ayush8923

[Ayush8923]

Thank you, @sleidig, for refactoring the formControl. It looks much better now. However, there was a minor issue where, if the user had already chosen push as the notification method, it wasn't being auto-selected. To fix this, I made some final changes and removed the hardcoded values from the notification method. This way, in the future, if we need to add an email option to the notification methods, we can simply add a new key to the notification method without requiring any code-level changes.

I have checked the functionality, and it's working well. Could you please review the final changes once? If any further modifications are needed, please let me know. Otherwise, the PR is ready to merge.

[sleidig]

Thanks for testing and improving! Unfortunately I had to remove the notifcation-method-select component to make all the properties work with formControls easily but taking the options out into a variable is a good approach