Remove noisy output from tests

"ui_out -until-grep" invocations used to redirect the output from
grep, usually to /dev/null.  Looks like the intention of 60fcc3443
(Change ui_out -until-grep to check for equality the next argument,
2024-11-02) was that grep no longer needs to print output, since we
can assert instead which is mildly better.

Unfortunately there are two places where -until-grep might not be
powerful enough, which is why we capture the output and check it
in the test script. For one of them we can use -until-grep with a
small change.  Not yet sure about the other one. Let's try to use
eval instead, so we can silence the output.

I realize -until-eval is not great (the nested quoting is ugly)
but I guess it's better than the status quo.

Alternatively, we could print output only if the [expected] argument
is not given, and add >/dev/null to the other invocations.

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