Remove qtcreator(_ide_branding).pri, and all remaining .pro/.pri
files that depend on it.
They have CMake files now.
Change-Id: I87d100b49df7ca95694a755cb581cb5eea26aa9a
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>