Remove .jy from script names (rebased onto dev_5_0)


This is the same as gh-2362 but rebased onto dev_5_0.

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See https://trac.openmicroscopy.org.uk/ome/ticket/12208

To test this properly, you'll need scripts with names that end in ".jy", such as those generated by https://github.com/imagej/imagej-omero/

If this is not possible (you don't have imageJ-OMERO installed locally) then you could manually create a script named.jy