Fix working of PURGE_VIEW_METADATA_ON_DROP

[ayushtkn]

Fixes: #4727

Checklist

• 🛡️ Don't disclose security issues! (contact security@apache.org)
• 🔗 Clearly explained why the changes are needed, or linked related issues: Fixes #
• 🧪 Added/updated tests with good coverage, or manually tested (and explained how)
• 💡 Added comments for complex logic
• 🧾 Updated CHANGELOG.md (if needed)
• 📚 Updated documentation in site/content/in-dev/unreleased (if needed)

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds purge-on-drop behavior for Iceberg views by passing view storage/location metadata into the cleanup task context, and verifies it via a new catalog test.

Changes:

• Enable PURGE_VIEW_METADATA_ON_DROP in the Iceberg catalog test setup.
• Update IcebergCatalog.dropView to collect view metadata + storage properties and pass them into dropTableLike for cleanup task creation.
• Add a new test asserting a cleanup task is created and includes STORAGE_LOCATION for dropped views.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 6 comments.

File	Description
runtime/service/src/main/java/org/apache/polaris/service/catalog/iceberg/IcebergCatalog.java	Builds and forwards purge cleanup task context for dropped views (including storage/location metadata).
runtime/service/src/test/java/org/apache/polaris/service/catalog/iceberg/AbstractIcebergCatalogTest.java	Enables the feature flag and adds coverage for drop-view-with-purge creating a cleanup task with storage location.