Fix condition for using parquet metadata cache

[arthurpassos]

Apache Iceberg queries were not htiting the parquet metadata cache because object_info->getFileFormat() resolves to IcebergDataObjectInfo::getFileFormat, which gets its return value from IcebergObjectSerializableInfo. This field is filled with the value from Apache Iceberg manifest file, and it is upper case by default, which then fails clickhouse check for parquet metadata cache usage.

Changelog category (leave one):

• Bug Fix (user-visible misbehavior in an official stable release)

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Fix apache iceberg queries not hitting the parquet metadata cache

Documentation entry for user-facing changes

...

CI/CD Options

Exclude tests:

• Fast test
• Integration Tests
• Stateless tests
• Stateful tests
• Performance tests
• All with ASAN
• All with TSAN
• All with MSAN
• All with UBSAN
• All with Coverage
• All with Aarch64
• All Regression
• Disable CI Cache

Regression jobs to run:

• Fast suites (mostly <1h)
• Aggregate Functions (2h)
• Alter (1.5h)
• Benchmark (30m)
• ClickHouse Keeper (1h)
• Iceberg (2h)
• LDAP (1h)
• Parquet (1.5h)
• RBAC (1.5h)
• SSL Server (1h)
• S3 (2h)
• S3 Export (2h)
• Swarms (30m)
• Tiered Storage (2h)

[github-actions]

Workflow [PR], commit [c7fa231]

[ianton-ru]

test test_storage_iceberg_with_spark/test_read_constant_columns_optimization.py::test_read_constant_columns_optimization is broken (#1629), ignore it.

[ianton-ru]

LGTM