ARROW-15707: [C++][FlightRPC] Make Flight tests more resuable across transports #12499
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This is intended to support ARROW-15706 and ARROW-15282. This splits out tests which do not touch the transport into their own test. Meanwhile, data plane methods are moved into a common library and can be instantiated for specific transports. This also does some cleanup to remove some redundant test helpers, and removes a DISABLED test that was effectively never being run.