Added #14230: Add option to deactivate expected checkin notifications for users

[Support-AEI]

Description

This pull request adds a setting in the form of a checkbox to the general settings page. When this is checked, the user and admin will receive an email if the check-in of an asset is expected/overdue. However, if the checkbox is not activated, only the admin will receive the notification that the return of an asset is expected or overdue.
This change affects the php artisan snipe-it:expected-checkin command.

Language strings for German and US-English and the migration file for the database are included.

Fixes #14230

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration.

• Tested with activated checkbox and asset overdue for check-in
• Tested without activated checkbox and asset overdue for check-in
• Tested with activated checkbox and without asset overdue for check-in
• Tested without activated checkbox and without asset overdue for check-in

Test Configuration:

• PHP version: 8.2.7
• MySQL version: Ver 15.1 Distrib 10.11.6-MariaDB
• Webserver version: Apache/2.4.57
• OS version: Debian GNU/Linux 12 (bookworm) Version 12.5

Checklist:

• I have read the Contributing documentation available here: https://snipe-it.readme.io/docs/contributing-overview
• I have formatted this PR according to the project guidelines: https://snipe-it.readme.io/docs/contributing-overview#pull-request-guidelines
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[what-the-diff]

PR Summary

• Improved User Notification Process
  A condition was added in the server-side command file responsible for sending expected check-in alerts. This means notifications will only be sent out to users when specific notification parameters are met.

• Updated Settings Control
  A new field representing user-level notification preferences was introduced in the Settings Controller. This affects how and when specific settings are updated.

• Database Enhancements
  A new update file was created to introduce a new column in the database under the settings table. This represents user-level notification preferences, allowing those settings to be stored and retrieved when required.

• Translation Additions
  In order to support various languages, new translations have been added for the newly introduced user-level notification preference field in both German and English.

• User Interface Update
  The settings page has been updated with a new form element for user-level notification preferences. This enables users to choose their preference directly on the website itself.

[snipe]

Thanks for this. Please remove the German translation file from this PR, as we use CrowdIn and the change you made will just be lost the next time we pull down translations.

I'm mostly loathe to add yet another setting option to be honest. We're working on revamping how notifications work, and I'm afraid this might just add more complexity down the line as we have to forklift existing functionality. I will discuss with the team internally.

[Support-AEI]

No problem, the German language strings are removed.

[Glukose1]

Hey, that would be nice to have. Has a decision been made yet as to whether it will be implemented?