test(rust): assert only stdout in command bats tests #3449
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Before this PR we assert output that includes both stdout and stderr in bats tests.
This makes the test fail when there is informational messages on stderr like upgrade available.
This PR fixes that with --separate-stderr option
https://bats-core.readthedocs.io/en/stable/writing-tests.html#run-test-other-commands
It require bats version 1.5.0 or greater.
https://bats-core.readthedocs.io/en/stable/warnings/BW02.html#how-to-fix