Execute all tests in particular folder

[tajchert]

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Either the existing command maestro test or the new one should execute all tests (.yaml files, maybe only those with correct syntax for Maestro) in the current directory (folder) or pass the directory as an argument.

Currently when I have few test cases I need to create either one test to combine them (using test nesting) or to pass them all as arguments to maestro test - in both cases adding new test require to remember about this and is a tedious step.