Fix illegal attempts to connect to NodeChunks

[cbentejac]

Description

This pull request addresses thread-safety and signal connection issues in the meshroom application, primarily by ensuring that certain operations involving Qt objects are executed on the main thread. This helps prevent crashes and undefined behavior when interacting with QML and Qt signals from background threads.

Qt Thread-Safety and Signal Handling Improvements:

• Ensured that clearSubmittedChunks is invoked on the main thread using QMetaObject.invokeMethod with Qt.QueuedConnection in meshroom/core/taskManager.py, to safely create NodeChunk QObjects for QML connections.
• Changed the connection of the timesAvailable signal to the compareFilesTimes slot in meshroom/ui/graph.py to use Qt.QueuedConnection, ensuring the slot is executed on the main thread.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.47%. Comparing base (b55440c) to head (62d3687).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3085   +/-   ##
========================================
  Coverage    83.47%   83.47%           
========================================
  Files           81       81           
  Lines        10300    10300           
========================================
  Hits          8598     8598           
  Misses        1702     1702           

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