Add warning when testpaths is set but paths are not found by glob #11044
+25
−0
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Closes #11013
Used PytestConfigWarning and setting warning_text string for message to follow convention for some of the other warnings, and set stacklevel to 3 so it shows the warning thrown by parse function. Tried to make the message concise, but if unclear please let me know and I can change!
Tested against steps to reproduce from #11006 and warning is shown.