[Managed Iceberg] refactor integration tests; make it easy to add a new catalog to test suite

[ahmedabu98]

Taking care of some tech-debt here.

Adding a top-level abstract base test class that defines integration tests for Managed Iceberg using a generic catalog.

To add a new catalog and run the integration tests against it, we just have to create a subclass and implement code for the following:

• creating the catalog
• providing the Managed Iceberg config

and potentially additional code for setup and cleanup.

See examples in HadoopCatalogIT and HiveCatalogIT for reference

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[ahmedabu98]

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[damccorm]

Nice! I like it