Fix Get variable list without VarFinder package was not implemented

Related Tickets & Packages

• https://processmaker.atlassian.net/browse/FOUR-21522

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• I have pulled this code locally and tested it on my instance, along with any associated packages.
• This code adheres to ProcessMaker Coding Guidelines.
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• This solution fixes the bug reported in the original ticket.
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• This solution does not implement any breaking changes that would invalidate documentation or cause existing Processes to fail.
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ci:package-savedsearch:FOUR-21522

The fail in the phpunit tests is related to:

permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get "http://%2Fvar%2Frun%2Fdocker.sock/v1.45/containers/json?all=1&filters=%7B%22ancestor%22%3A%7B%22pm4-eks-phpunit%3Alatest%22%3Atrue%7D%7D": dial unix /var/run/docker.sock: connect: permission denied
must specify at least one container source

Caused to the executors microservice, not to the branch changes.