Rollup merge of #143452 - Kobzol:completions-fix, r=jieyouxu

Fix CLI completion check in `tidy`

The list of CLI completion files that were generated and that were checked by `x test tidy` was not synced. Recently, some PR only updated some of the files, which caused the rest of the files (not checked by `x test tidy`) to be dirty on `master`. This PR fixes the logic in bootstrap to always synchronize the list of completion paths.

Fixes: https://github.com/rust-lang/rust/issues/143451

r? `@jieyouxu`