vine: manager check temps

[btovar]

Manager checks that temp files were created when task is done. If not, task is marked missing output.

Fixes issue where function calls and tasks may lie about an exit code 0 without generating required temp files.

Post-change actions

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• [x] make test Run local tests prior to pushing.
• [x] make format Format source code to comply with lint policies. Note that some lint errors can only be resolved manually (e.g., Python)
• [x] make lint Run lint on source code prior to pushing.
• [ ] Manual Update Did you update the manual to reflect your changes, if appropriate? This action should be done after your changes are approved but not merged.
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• [ ] Product Labels Select github labels for the product affected: TaskVine, Makeflow, etc.
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Additional comments

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[btovar]

The only library that dies on exception is the one using the direct method, but that's the way it works. In the other case, it is only the forked child that terminates, and does so even when successful.