[Chapel Merge] Improve param-inf test an param real to string cas

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Branch: refs/heads/main
Revision: a577edd
Author: mppf
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Merge pull request #20122 from mppf/fix-param-inf

Improve param-inf test an param real to string casts

Adjust param-inf to avoid outputing negative nans and also adjusted param
real : string cast to use inf / nan instead of INFINITY / NAN to better
match regular output of these values.

We were observing failures for param-inf on an arm system due to
differences in whether or not the NANs were negative. But, a NAN being
positive or negative is not guaranteed by C/C++ (the param-evaluation is
happening in C++ code within the compiler) and Chapel isn't trying to do
anything special for the sign of NANs.

Resolves https://github.com/Cray/chapel-private/issues/3520

Reviewed by @ronawho - thanks!