Make setting CHPL_* environment variables to invalid values an error #26501
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Makes most CHPL_* environment variables produce an error if set to an invalid value. This can help prevent user error when accidentally doing the wrong thing.
For example, a user might misspell something or just misunderstand how to set a variable. Previously, we would just silently take that value and maybe break in expected ways later. Now, we refuse to accept it and tell the user exactly what they did wrong
Previously,
Now,