Cherry-pick #17972 to 7.x: Fix filebeat script tester tests #18090
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Cherry-pick of PR #17972 to 7.x branch. Original message:
What does this PR do?
The tester assumes pipelines have a JSON extension. So it started failing when the
one of the pipelines was changed to YAML. I made changes to fix the test, but added
an explicit error if you try to use this tool with a YAML pipeline.
Additionally I noticed this tool does not handle templated pipelines.
Why is it important?
The tests are failing.