Update templatefile function error message to support multiple missing variables. #25424
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In reference to issue #25382, this PR updates the error returned by
templatefile
when there is more than one undeclared template variable. The new error inform the user of each missing template variable. Previously, the error would only mention one. I added one test relevant to the change and a new test data file for it as well.Please let me know if any changes need to be made to get this PR approved!