Fix running python_sources with pex --executable (Cherry-pick of #21047) #21086
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This fixes the feature added in #20497 as it broke using
pants run
on a python_source if the file name has-
or other invalid characters. Bug reported here:https://pantsbuild.slack.com/archives/C046T6T9U/p1717624913138789?thread_ts=1717624913.138789&cid=C046T6T9U
The other integration test for the pex --executable feature only tested running pex_binary, not python_source. So, I missed applying some of the path logic to both cases.