Update Trino 478 release notes

[findepi]

Add entries for recently merged PRs.

Summary by Sourcery

Update Trino 478 release notes to include newly merged changes

Documentation:

• Add entry for fixing flush_metadata_cache procedure failure when metastore impersonation is enabled
• Add entry for improving performance of ALTER TABLE EXECUTE OPTIMIZE on bucket-transform partitioned tables

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR updates the Trino 478 release notes by adding two new bullet entries: a fix for the flush_metadata_cache procedure when metastore impersonation is enabled, and a performance enhancement for ALTER TABLE EXECUTE OPTIMIZE on bucket‐partitioned Hudi tables.

Sequence diagram for flush_metadata_cache procedure fix with metastore impersonation

sequenceDiagram
    participant User
    participant Trino
    participant Metastore
    User->>Trino: Call flush_metadata_cache procedure
    Trino->>Metastore: Request cache flush (with impersonation enabled)
    Metastore-->>Trino: Confirm cache flush
    Trino-->>User: Procedure completes successfully

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File-Level Changes

Change	Details	Files
Add fix entry for flush_metadata_cache procedure failure when metastore impersonation is enabled	Insert new bullet under the main release notes section	docs/src/main/sphinx/release/release-478.md
Add performance improvement entry for ALTER TABLE EXECUTE OPTIMIZE on bucket transform partitioning in the Hudi connector	Insert new bullet under the Hudi connector section	docs/src/main/sphinx/release/release-478.md

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