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Description
Reason
The ElementGenerator tests in test/tests/meshgenerator/element_generator/ don't do a very good job of showing "useful" capability. There are two input files, one that generates a single element and one that generates two elements with two separate generators. In the second case, the elements touch but they create a duplicate node. This is generally not what a "new" user would probably want. Instead, we should probably show that you can generate a connected mesh and perhaps show that you can invoke a sticker for a case like we have now. Perhaps demonstrating that you can generate two disconnected subdomains might be another use case.
Design
Improved test cases that better demonstrate the ElementGenerator's capabilities.
Impact
Minor: Avoids confusion