Implement Monthly Reminder Service

[mayura-andrew]

Purpose

The purpose of this PR is to fix #176

This issue involves enhancing the EmailReminderService to ensure that email reminders are scheduled and processed correctly, with proper handling of retries and failures.

Goals

1. Implement a robust EmailReminderService that schedules and processes email reminders.
2. Handle maximum retries by logging and saving failed reminders.
3. Improve the overall reliability and maintainability of the reminder service.

Approach

Screenshots

Checklist

• [x] This PR doesn't commit any keys, passwords, tokens, usernames, or other secrets.
• [x] I have read and understood the development best practices guidelines ( http://bit.ly/sef-best-practices )
• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation

Related PRs

## Test environment ## Learning