CMake: Install non-main-config tools and executables to a subdir

When using Ninja Multi-Config, we don't want to install a "Release"
moc.exe, and then override it with a "Debug" moc.exe.

Because it doesn't seem possible to exclude installation of targets
per configuration, put the non-main configuration tools into
configuration specific subfolders like "bin/Debug", so no overriding
happens upon installation.

Introduce a new function qt_get_install_target_default_args() which
returns install destination arguments for consumption in qt_install()
calls. The function adds the config-specific suffix to the destination
for the appropriate configs.

Each call to qt_install *adds* new rules for installation,
which means that export registration needs to happen only on the first
call.

Make sure qt_add_tool doesn't ask qt_add_executable to install
yet again, to create duplicate rules.

Apply the same install arguments logic to qt_add_executable calls.

Task-number: QTBUG-80900
Task-number: QTBUG-80901
Change-Id: I3e732d27dba5bf5f8059d2878ef1e425237d383a
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>

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