SG-37555 Removed old build_resources.sh

[eduardoChaucaGallegos]

This pull request updates the way UI resources are built and managed for the launch_indicator_dialog component. The main changes include removing the old shell script for building Qt UI files, updating the resource configuration to use a new build system, and regenerating the splash_new.py UI file using a more modern version of the Qt UI compiler.

Build system improvements:

• Removed the legacy build_resources.sh shell script, which previously handled building the splash_new UI file using older tooling.
• Updated build_resources.yml to add a new entry for building the splash_new UI file in the launch_indicator_dialog module, specifying the source and destination for the generated Python files.

UI file updates:

• Regenerated splash_new.py using Qt User Interface Compiler version 5.15.2, resulting in modernized code style, updated import handling, and improved compatibility with newer Qt/PySide versions.
• Updated widget instantiation and layout code in splash_new.py for improved clarity and maintainability, including explicit object naming and use of updated Qt classes.