Invoke OffsetCommitCallback immediately on commit failure

[yangfeng123456]

What’s the problem:

• When commitOffsetsAsync fails, the client callback sometimes doesn’t get called.
  This can leave clients hanging, not knowing their commit actually failed.

What’s the fix:

• In doCommitOffsetsAsync.onFailure, call the provided OffsetCommitCallback immediately if it’s not null.
• This ensures clients are always notified about commit failures, fixing KAFKA-10489.

Things to note:

• Rare edge case: if a rebalance happens while a commit is in flight, the callback might be triggered twice.
• Overall, this is safer than the current behavior where clients might never hear about the failure.