Fix iceberg connector bug not returning external location with show create table

[austenLacy]

Fixes: #9732

When doing a show create table some_table for an iceberg table, Trino does not return the location property if one is defined.

trino > create table test_iceberg.schema1.some_table (c1 VARCHAR, c2 VARCHAR)
with (
    format = 'PARQUET',
    partitioning = ARRAY['c1'],
    location = 'gs://some/path'
);

...

trino> show create table test_iceberg.schema1.some_table;

CREATE TABLE test_iceberg.schema1.some_table (
   c1 varchar,
   c2 varchar
)
WITH (
   format = 'PARQUET',
   partitioning = ARRAY['c1']
)

before the fix

after the fix

[findepi]

Can you please check related build failures?

[austenLacy]

@findepi I pushed fixes for the unit and integration tests. There are some other failures with the recent CI run, but they look unrelated to these changes.

[findepi]

i've retriggered the CI