[M1] Install "jpeg<=9b" rather than OpenJpeg (#6122)
[M1] Install "jpeg<=9b" rather than OpenJpeg (#6122)

Explicitly set PATH to point to `conda` binary, otherwise libjpeg detection logic does not work
Pin libjpeg to the same version on x86 and m1
Add simple tests that jpeg can be decoded by a generated wheel
pytorch/vision,pytorch/vision,pytorch/vision,pytorch/vision,pytorch/vision,pytorch/vision