JENKINS-75956: Add charset support to readFileFromWorkspace function
#1605
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When I tried to upgrade Jenkins using Java from 17 to 21 at Windows, I got an error due to 'JEP 400: UTF-8 by Default'. To work around this issue, we can use '-Dfile.encoding=COMPAT' or convert all files you load to UTF-8, but I would like to be able to solve this problem just with this plugin.
The bug is the belief that when processing text files in Java, I should specify the character encoding.
JENKINS-75956: https://issues.jenkins.io/browse/JENKINS-75956
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