Don't let a background task call run_background_tasks() #1773
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This PR prevents recursive calls to
run_background_tasks().In the nrf port, the filesystem flush code was setting the on-board NeoPixel. This code is often called from the background. The NeoPixel code has a long wait in it, and it runs background code while waiting. So background code was calling background code on the nrf port. This caused a debug build to hang up or run very slowly, and possibly had performance impacts on the regular build as well.