[GIE/tests] Add `PathExpand` test cases for GIE

There currently lacks in `PathExpand` test cases in GIE (e2e), especially that we provide syntactic sugars in `PathExpand` to denote some complex situations. About the syntactic, you can refer to the Doc:
https://graphscope.io/docs/latest/interactive_engine/supported_gremlin_steps#pathexpand

It's thus welcome to add more `PathExpand` test cases. It's easy to do so, simply prepare the `PathExpand` case and the expected result (by using Tinkerpop) in:
https://github.com/alibaba/GraphScope/blob/main/interactive_engine/compiler/src/main/java/com/alibaba/graphscope/gremlin/integration/suite/standard/IrGremlinQueryTest.java

You can run the test locally according to: https://graphscope.io/docs/latest/interactive_engine/dev_and_test
The case will also be verified in the ci workflow.