[Milestone 3] Blob Compaction Service

### Task Description

**What needs to be done:**
TBD

**Why this task is needed:**

### Task Type

Code improvement/refactoring

### Related Issues

**Parent feature issue:** (if applicable )
**Related issues:**
NOTE: Use `Relationships` button to add parent/blocking issues after issue is created.

The issue body names no files, tests, entry points, scope, or acceptance criteria; begin by clarifying what the Blob Compaction Service should change and how it will be validated. Once those details are provided, identify the relevant Hudi implementation and tests, then use the agreed behavior as the definition of done.

Written by the indexing model from the issue text.