pro2cmake: Generate public CMake API code for projects by default

Previously pro2cmake assumed that all .pro were internal Qt projects
like qtbase/src/corelib.pro and generated private api calls like
qt_internal_add_module().

Public CMake API calls (like qt_add_executable) were only generated if
an --is-example command line flag was passed to the script or if the
.pro file was located under the examples subfolder of a qt repo source
directory (indicated by the presence of a .qmake.conf file).

Change the logic to always generate public CMake API code by default,
unless a .cmake.conf/.qmake.conf file is encountered with a valid repo
module version inside, in which case apply the old heuristic of
checking for the ./examples subfolder.

The intention is to have a sensible default so that Qt users can use
the script to more easily migrate their qmake projects without having
to explicitly specify the --is-example flag.

Pick-to: 6.2
Task-number: QTBUG-96799
Change-Id: I38f4f1b349a5b9688cf7bc5914d4fde72e660a98
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>

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