Ed Page 023f4c66ca test: Remove completion tests
The tests are intended to spot check that shell completions are
registered correctly.  That is a low change, low risk area.  For shell
integration, we're relying on `clap_complete`s tests.
For our own candidates, we should test the candidate generation
directly, rather than end-to-end.

This reverts parts of commit e7ca9bec80ab5c010c1a84690816da7b64008257, reversing
changes made to bd5f32bb1c7ca273b5d86815bf0ae4adba59ddd8.

Fixes #14545
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..
2024-09-24 08:58:57 -05:00