Core: Exclude unexpected namespaces JdbcCatalog.listNamespaces

[ebyhr]

JdbcCatalog.listNamespaces returned unexpected namespaces because of LIKE with %.

The updated testListNamespace test fails without this change:

    List<Namespace> nsp1 = catalog.listNamespaces(Namespace.of("db"));
    assertThat(nsp1).hasSize(3);

Expected size: 3 but was: 4 in:
[db.ns1, db.ns2, db.ns3, db2.ns4]
java.lang.AssertionError: 
Expected size: 3 but was: 4 in:
[db.ns1, db.ns2, db.ns3, db2.ns4]

Fixes #10213

[nastra]

@ebyhr thanks for working on this and it would be great to get this into 1.6.0.

[ebyhr]

Addressed comments. Sorry for my late response. Iceberg IntelliJ project somehow broke after sending this PR.

[Fokko]

Thanks @ebyhr for working on this 👍 Thanks @findepi and @jbonofre for the review