NIFI-15553 Replaced the use of jars in TestExecuteStreamCommand with the use of java files.

[dan-s1]

Summary

NIFI-15553

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  • JDK 21
  • JDK 25

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[exceptionfactory]

Thanks for refactoring this test class and removing the need for these compiled JAR files in the repository @dan-s1, looks good! +1 merging