[server] Complete the corresponding consumer action future in SIT close

[xunyin8]

[server] Complete the corresponding consumer action future in SIT close

In SIT internal close we drain the consumer action queue and process DROP_PARTITION and RESET_OFFSET messages. However, when we process them we did not complete their corresponding future. This breaks any logic that are waiting for those futures and create false positive timeout errors.

How was this PR tested?

New unit test

Does this PR introduce any user-facing changes?

• No. You can skip the rest of this section.
• Yes. Make sure to explain your proposed changes and call out the behavior change.