Also run the `rust` checks on "milestone" CLI releases, to ensure we
remain backward compatible with those versions. This was prompted by
#2960 (review)

Running this on current `main` and then on that PR should improve our
confidence we remain backward compatible.

It also turns out a probable `ruamel.yaml` update was changing a lot of
generated workflows, so I've:
* fixed the `ruamel.yaml` version to the latest in `sync.sh`
* added `yaml.width = 120` in `sync.py` to minimize (but not entirely
  remove) the number of changes
* checked in the workflows whose formatting was changed by the new
  `ruamel.yaml` version

mbg approved these changes Aug 12, 2025

mbg deleted the redsun82/rust-test branch

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