Throw TrinoException in dropNamespace when REST error

[pajaks]

Description

In case External REST catalog throws exception it should be wrapped into TrinoException and have more clear error type.

Additional context and related issues

Example stack:

 "type": "org.apache.iceberg.exceptions.ForbiddenException",
  "message": "Forbidden: Access Denied",
  "suppressed": [],
  "stack": [
    "org.apache.iceberg.rest.ErrorHandlers$DefaultErrorHandler.accept(ErrorHandlers.java:212)",
    "org.apache.iceberg.rest.ErrorHandlers$NamespaceErrorHandler.accept(ErrorHandlers.java:180)",
    "org.apache.iceberg.rest.ErrorHandlers$NamespaceErrorHandler.accept(ErrorHandlers.java:166)",
    "org.apache.iceberg.rest.HTTPClient.throwFailure(HTTPClient.java:201)",
    "org.apache.iceberg.rest.HTTPClient.execute(HTTPClient.java:313)",
    "org.apache.iceberg.rest.HTTPClient.execute(HTTPClient.java:252)",
    "org.apache.iceberg.rest.HTTPClient.delete(HTTPClient.java:389)",
    "org.apache.iceberg.rest.RESTClient.delete(RESTClient.java:52)",
    "org.apache.iceberg.rest.RESTSessionCatalog.dropNamespace(RESTSessionCatalog.java:530)",
    "io.trino.plugin.iceberg.catalog.rest.TrinoRestCatalog.dropNamespace(TrinoRestCatalog.java:147)",
    "io.trino.plugin.iceberg.IcebergMetadata.dropSchema(IcebergMetadata.java:901)",
    "io.trino.plugin.base.classloader.ClassLoaderSafeConnectorMetadata.dropSchema(ClassLoaderSafeConnectorMetadata.java:430)",
    "io.trino.tracing.TracingConnectorMetadata.dropSchema(TracingConnectorMetadata.java:358)",
    "io.trino.metadata.MetadataManager.dropSchema(MetadataManager.java:789)",
    "io.trino.tracing.TracingMetadata.dropSchema(TracingMetadata.java:382)",
    "io.trino.execution.DropSchemaTask.execute(DropSchemaTask.java:79)",
    "io.trino.execution.DropSchemaTask.execute(DropSchemaTask.java:37)",

Release notes

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# Section
* Fix some things. ({issue}`issuenumber`)