test(reminder): fix firebase errors

[jumpy-cat]

Description

The existing reminders code couldn't be tested without the side effect of firebase interactions. Refactored it to make testing the logic without triggering side-effects possible, then modified the tests accordingly. This should stop the error during test style messages from occuring when you run the tests.

Type of Change

• Refactor / code improvement

Related Issues

none

Changes Made

• Backend (TypeScript):
  • firebase is only initialized if initializeReminders is called
    • added call to jobs.ts
  • the main reminders class has a new field pure that dictates if it will do any firebase things, set via the mock argument in the constructor
    • { mock: false } in actual services
    • { mock: true } in test code
  • refactored existing update cancelling stuff a bit to make the code clearer
• Firebase / Shared:
  • none

Testing Done

Flutter:

• Do reminders still send?
  • Android Emulator
  • Physical device

Screenshots / Demo (if UI or notification change)

n/a

Checklist

• Commit messages follow Conventional Commits
• PR title follows [type](scope): short description
• PR target branch is not main and is our current working update branch (e.g. maizebus2.1)
• No print() / debugPrint() / console.log() left in production code
• Secrets / keys not committed

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