Destination Iceberg: Fix object type handling

[edgao]

closes https://github.com/airbytehq/airbyte-internal-issues/issues/11038

Probably easiest to review by commit:

1. Fix the nessie test config. Nessie tests were just hard crashing :/
2. Fix all the issues with schemaless types (object with empty schema, etc)
   • some incidental changes to ExpectedRecordMapper - ended up not needing these, but they'll be useful in a future PR
   • update the mapper pipeline to actually convert schemaless types to StringType
     • the parquet pipeline doesn't do this for some reason :/ johnny ran into a bug related to this at some point, but I can't seem to repro here 🤷
     • if we do have issues later on, we can just do what parquet does (i.e. have the AirbyteValueToIcebergRecord explicitly handle ObjectWithoutSchema/etc instead of just crashing)
   • update the data dumper to coerce values by their actual type, rather than by the declared schema - previously the data dumper also crashed on these types
3. Update the RecordDiffer to correctly handle nullEqualsUnset in nested structs
4. cleanup + formatting

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[subodh1810]

@edgao for the following, raised a PR to fix it #49854

TODO: timestamps are broken (class java.time.OffsetDateTime cannot be cast to class java.time.LocalDateTime)

[jdpgrailsdev]