Print info about current project file in use to stderr and ignore the imports by default (#10548)

* Print info about current project file in use to stderr (fix #10547)

* only report top-level project config files in the default verbosity

in verbose mode report imported files too

* fix tests

* don't print anything when provenance is empty

* fix tests

* Apply suggestions from code review

Co-authored-by: ffaf1 <fa-ml@ariis.it>

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Co-authored-by: ffaf1 <fa-ml@ariis.it>