[GIE/tests] Add PathExpand test cases for GIE #2882
Description
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.