Use better names for engine/KCL tests (#3193)
'serial_test' isn't actually accurate. Two of these tests run in parallel now. So I renamed it 'kcl_test' as that's what it's actually doing. In the nextest config, I changed the label from 'serial-integration' to 'uses-engine' because the former isn't true, and also doesn't explain _why_ it's being limited. The new name explains why we're limiting the number of tests that can run in parallel.
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