Fix double-click handling in UI lists and improve test suite for missing MPQ assets

[skypher]

Summary

This PR contains two sets of improvements:

1. Fix double-click handling in UI lists

• Fixed an issue with double-click handling in the UI list components

2. Gracefully handle missing MPQ assets in test suite

Modified the test suite to handle missing MPQ assets (spawn.mpq/DIABDAT.MPQ) gracefully instead of failing hard.

Changes:

• Tests now run even when MPQ assets are not present
• Tests requiring MPQ skip gracefully using GTEST_SKIP()
• Added custom GoogleTest listener to track and display skip reasons
• Clear summary shown at end explaining why tests were skipped

Benefits:

• Test suite can run in CI/CD environments without MPQ assets
• Clear feedback about which tests couldn't run and why
• No more hard failures when assets are missing

Example output when MPQ is missing:

========================================
Test Skip Summary
========================================
Total tests skipped: 19

  • 19 tests skipped: MPQ assets (spawn.mpq or DIABDAT.MPQ) not found
    (18 tests automatically skipped due to test suite setup failure)
========================================

Test plan

• All tests pass with MPQ assets present (290/290 tests)
• All tests skip gracefully without MPQ assets with clear messages
• Skip summary shows reasons for skipped tests

[skypher]

Wrong target repository - recreating PR on skypher/DevilutionX

[AJenbo]

if this is just to keep your fork in sync there should be a button to do so on github, or you can simply reset your local master to the upstream master and push to your fork. Doing it by merging PRs on github will create additional commits