[Managed Iceberg] refactor integration tests; make it easy to add a new catalog to test suite #33444
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Taking care of some tech-debt in this PR.
Adding a top-level abstract test class that defines some integration tests for Managed Iceberg using a generic catalog.
To add a new catalog and run the integration tests against it, we'd just have to create a new subclass that extends the base class and implement code for the following:
and optionally, additional code for setup and cleanup.
See examples in HadoopCatalogIT and HiveCatalogIT for reference