[FrameworkBundle] Register a NullLogger from test kernels #24385
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Relates to #24300
This will avoid unnecessary output on Travis or when running FrameworkBundle tests locally:
but also needed for anyone running functional tests on their project and using the default logger, in order to not get garbage output.
Do we need to find a more generic solution (like exposing a
framework.default_logger
option so users can set it to false for test)? Or just documenting this?