Rename misleading loop counter variable in storage tier change script

[Copilot]

Addresses review feedback from PR #62 regarding a misleading variable name in the storage class change loop.

Changes

• Renamed objects_changed → processed_count in the main processing loop (lines 338, 350)

The variable is a 1-indexed loop counter tracking iteration progress, not a count of successfully changed objects. Success/failure counts are tracked separately in stats["succeeded"] and stats["failed"].

# Before
for objects_changed, (obj_key, current_class) in enumerate(objects_to_change, start=1):
    # ...
    if objects_changed % 100 == 0 or objects_changed == len(objects_to_change):

# After  
for processed_count, (obj_key, current_class) in enumerate(objects_to_change, start=1):
    # ...
    if processed_count % 100 == 0 or processed_count == len(objects_to_change):

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