[FLINK-38470] Make CreateMaterializedTableOperation return ResolvedCatalogMaterializedTable

[raminqaf]

What is the purpose of the change

This pull request fixes a type inconsistency in CreateMaterializedTableOperation where the getter method returns the parent type CatalogMaterializedTable instead of the actual stored type ResolvedCatalogMaterializedTable. This creates unnecessary type loss and is inconsistent with similar operations like CreateTableOperation which correctly returns ResolvedCatalogTable.

Brief change log

• Changed CreateMaterializedTableOperation.getCatalogMaterializedTable() return type from CatalogMaterializedTable to ResolvedCatalogMaterializedTable to match the field type and align with the pattern used in CreateTableOperation

Verifying this change

This change is already covered by existing tests, such as:

• All existing tests continue to pass since ResolvedCatalogMaterializedTable implements CatalogMaterializedTable (safe covariant return type change)

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): no
• The public API, i.e., is any changed class annotated with @Public(Evolving): no (class is @Internal)
• The serializers: no
• The runtime per-record code paths (performance sensitive): no
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
• The S3 file system connector: no

Documentation

• Does this pull request introduce a new feature? no
• If yes, how is the feature documented? not applicable

[flinkbot]

CI report:

• e9f87ba Azure: SUCCESS

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[raminqaf]

re-ordered the fields they way they are defined in the constructor