Update Refund Policy Based on Cancellation Policy

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  Description

  This pull request updates the refund policy based on the cancellation policy for trips. It also includes some code refactoring and improvements.

Summary

• Updated the refund logic in the handle_refund function to check the cancellation policy of the property and calculate the refund amount accordingly.
• Added a new function process_cancel_refund to handle the cancellation refund process.
• Refactored the create_cal_for_property function to use consistent naming conventions and improve readability.
• Added a new function create_trips_from_ics to create trips from an external iCal calendar.
• Updated the auto_complete function to handle the completion of trips based on the current time and trip end time.

Fixes #32.

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Sandbox Executions

• [X] Ran sandbox for tasks.py. ✓

  Sandbox logs for https://github.com/PrenSJ2/teamworks_api/commit/06ed811bfa44ad9a348af1dc93dd24cc96429874

trunk fmt tasks.py || exit 0 1/2 ✓

 ✔ Formatted tasks.py
Re-checking autofixed files...

 ✔ Formatted tasks.py
Re-checking autofixed files...

Checked 1 file
✔ No issues
Run trunk upgrade to upgrade 1 linter

trunk check --fix --print-failures tasks.py 2/2 ✓

  ISSUES  
tasks.py:359:0
 359:0  medium  Requests call without timeout  bandit/B113
Checked 1 file
1 existing issue

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Apply Sweep Rules to your PR?

• [ ] Apply: All new business logic should have corresponding unit tests.
• [ ] Apply: Refactor large functions to be more modular.
• [ ] Apply: Add docstrings to all functions and file headers.