Add ability to select PyQt debug mode via environment variable for testing (PY-23290)
Add ability to select PyQt debug mode via environment variable for testing (PY-23290)

(cherry picked from commit fa0c664)

fabioz/PyDev.Debugger,Elizaveta239/PyDev.Debugger,Elizaveta239/PyDev.Debugger,Elizaveta239/PyDev.Debugger,fabioz/PyDev.Debugger,fabioz/PyDev.Debugger,fabioz/PyDev.Debugger,Elizaveta239/PyDev.Debugger,fabioz/PyDev.Debugger,Elizaveta239/PyDev.Debugger