Tracing/QmlProfiler: Port shaders to Qt 6

For each shader in Tracing and QmlProfiler:
- Add a vert/frag variant in Vulkan style GLSL
- Include the shader via qt_add_shaders
- Implement RHI/Qt6-specific code for loading the shaders and for
  updating the uniform buffer
- Set the material's QSGMaterial::CustomCompileStep flag to affect the z
  value the same way as the Qt 5 code does

Building of Tracing, QmlProfiler, etc. with Qt 6 depends on the Qt
Shader tools being installed.

Fixes: QTCREATORBUG-20575
Change-Id: I9aba5a777da9a549da0cdd0a217dfcb346c72e58
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

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