Add automation scripts tests

[TechGenie-awake]

Description

Added comprehensive test coverage for automation scripts in the tools folder:

• automation_prepare_adhoc_availability.py – Tests for mentor availability logic, including sorting, XLSX → YAML updates, and handling of missing or empty data.
• download_image.py – Tests for image download, filename sanitization, error handling, and automation script behavior.
• meetup_import.py – Tests for event parsing, description cleaning, host/speaker extraction, image URL fetching, and YAML processing.

Change Type

• Bug Fix
• New Feature (tests added for existing scripts)
• Code Refactor
• Mentor Update
• Data Update
• Documentation
• Other

Related Issue

resolves #579

Screenshots

Pull request checklist

Please check if your PR fulfills the following requirements:

• I checked and followed the contributor guide
• I have tested my changes locally.
• I have added a screenshot from the website after I tested it locally

[dricazenck]

Based in the test execution, which you can see from github actions, it all passing :) great work 👍

Run pytest tools
============================= test session starts ==============================
platform linux -- Python 3.12.11, pytest-8.1.1, pluggy-1.6.0
rootdir: /home/runner/work/WomenCodingCommunity.github.io/WomenCodingCommunity.github.io
collected 45 items

tools/example_test.py .                                                  [  2%]
tools/tests/automation_functional_test.py .                              [  4%]
tools/tests/automation_prepare_adhoc_availability_test.py .............. [ 35%]
.                                                                        [ 37%]
tools/tests/download_image_test.py .......                               [ 53%]
tools/tests/file_utils_test.py ....                                      [ 62%]
tools/tests/meetup_import_test.py .............                          [ 91%]
tools/tests/mentorship_type_test.py ....                                 [100%]

=============================== warnings summary ===============================
tools/tests/automation_functional_test.py: 2 warnings
tools/tests/automation_prepare_adhoc_availability_test.py: 9 warnings
  /opt/hostedtoolcache/Python/3.12.11/x64/lib/python3.12/site-packages/openpyxl/packaging/core.py:99: DeprecationWarning: datetime.datetime.utcnow() is deprecated and scheduled for removal in a future version. Use timezone-aware objects to represent datetimes in UTC: datetime.datetime.now(datetime.UTC).
    now = datetime.datetime.utcnow()

tools/tests/automation_prepare_adhoc_availability_test.py::TestUpdateMentorAvailability::test_updates_mentor_availability_from_xlsx
tools/tests/automation_prepare_adhoc_availability_test.py::TestUpdateMentorAvailability::test_mentor_not_in_xlsx_becomes_unavailable
tools/tests/automation_prepare_adhoc_availability_test.py::TestUpdateMentorAvailability::test_keeps_existing_hours_when_xlsx_hours_empty
  /opt/hostedtoolcache/Python/3.12.11/x64/lib/python3.12/site-packages/openpyxl/writer/excel.py:292: DeprecationWarning: datetime.datetime.utcnow() is deprecated and scheduled for removal in a future version. Use timezone-aware objects to represent datetimes in UTC: datetime.datetime.now(datetime.UTC).
    workbook.properties.modified = datetime.datetime.utcnow()

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
======================= 45 passed, 14 warnings in 1.30s ========================

There some warnings and deprecations, but I think it is a great start! Thanks @TechGenie-awake
More details you can see here