Spark: Filter views from SparkCatalog.listTables

### Problem

`SparkCatalog.listTables` delegates directly to the underlying Iceberg catalog:

```java
return icebergCatalog.listTables(Namespace.of(namespace)).stream()
.map(ident -> Identifier.of(ident.namespace().levels(), ident.name()))
.toArray(Identifier[]::new);
```

Most Iceberg catalogs return only tables. However, `HiveCatalog` with `list-all-tables=true` returns every matching metastore entry, including views. As a result, `SparkCatalog.listTables` may expose views even though Spark's `TableCatalog.listTables` contract requires table identifiers only.

Spark 4.2 makes the distinction explicit through `RelationCatalog`: `listTableSummaries` returns tables only, while `listRelationSummaries` combines table and view summaries. `SparkCatalog.listTableSummaries` already subtracts identifiers returned by `listViews`, but `listTables` remains unfiltered.

This behavior predates Spark 4.2 and is not a regression in the Spark 4.2 support PR.

### Proposed fix

- Filter view identifiers from `SparkCatalog.listTables`, including the `HiveCatalog` `list-all-tables=true` configuration.
- Apply the correction consistently to supported Spark versions where the same implementation is present.
- Add coverage that creates both a table and a view in the same namespace and verifies that `listTables` returns only the table.

### Context

Recorded during review of Spark 4.2 support in #14984: https://github.com/apache/iceberg/pull/14984#discussion_r3788259677

Locate SparkCatalog.listTables, listTableSummaries, and listViews, then inspect the existing Spark catalog test coverage. Add coverage that creates a table and view in one namespace and verifies listTables returns only the table across supported implementations or versions; run the relevant tests to confirm view identifiers are excluded.

Written by the indexing model from the issue text.