Fix SHOW CREATE SCHEMA failure due to unsupported properties

[ebyhr]

Description

Fixes #24744

Release notes

## Iceberg
* TBD. ({issue}`24744`)

Summary by Sourcery

Filter out unsupported namespace properties to avoid failures in SHOW CREATE SCHEMA and ensure only the LOCATION property is retained when loading namespace metadata across Iceberg catalogs.

Bug Fixes:

• Filter out non-LOCATION namespace properties in REST and Nessie catalogs during loadNamespaceMetadata
• Remove propagation of Glue catalog database parameters so only LOCATION_PROPERTY is returned

Enhancements:

• Introduce abstract createNamespaceWithProperties helper in BaseTrinoCatalogTest and implement it in each catalog test

Tests:

• Add testSchemaWithInvalidProperties to verify unsupported namespace properties are ignored