Run CI tests with 1.58.1 and stable, and publish a MSRV.

[egrimley-arm]

(Perhaps it should have been an MSRV?)

[egrimley-arm]

Currently one sees: "All tests Expected — Waiting for status to be reported" because (I think) GitHub is waiting for the test called "All tests" to finish. But there no longer is a test with that name because this PR renames that test! It seems like a bug in the design of GitHub CI, and it seems to be discussed here: https://github.com/orgs/community/discussions/26733

Any ideas for what should be done?

[ionut-arm]

I'll merge it manually if you're okay with that

[egrimley-arm]

Any ideas for what should be done?

If there isn't a neater solution, perhaps someone who is an "Owner" of this repo should change the settings (Settings -> Branches -> Branch protection rule -> Edit, or Settings -> Rules -> Rulesets -> ..., depending on how it's been set up) just before this is merged.

[egrimley-arm]

I'll merge it manually if you're okay with that

OK. And then change the rules afterwards, presumably. (Or one could delete the names of the tests from the settings, lose the automation and assume that a PR won't get two approvals if it's failing its tests.)