Don't orphan old julia versions when failing to delete them. #1205
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Alternative to #1146 fixes #1153
only remove a version from the installed version database if we successfully deleted them.
When failing to remove a version, at least on windows, it is most likely that that version is still running somewhere.
Added a bit of text to hint at that possibility.
With this change
juliaup gc
works as intended after that message.regarding #1146: it might still be useful to have orphan pruning capabilities as a fallback, but i've opted to keep the two PRs separate for easier review and merging