Add application icon support and update build configuration (#31)

* Add application icon support and update build configuration

* Refactor: Update release notes generator and build workflow to use committed app icon assets

* Add application icon asset and improve app identity handling

* Refactor: Update tests for release notes generator to align with new implementation and enhance functionality

* Refactor: Update Windows AppUserModelID to use a simplified app ID for consistency

* Update .github/workflows/release-build.yml

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update tests/test_release_notes_generator.py

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Refactor: Update assertions in sanitize notes test for clarity and consistency

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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: duartebarbosadev