Timer cancellation is not reliable

We detect whether the timer was canceled in ad-hoc ways.
Especially, if a lock is involved, the situation is not desirable.
This commit addresses that: https://github.com/CodeChain-io/codechain/commit/96f7f942f3021b4154a5da14bbd7680c1e080200

We need a regular mechanism to know fired timeout is canceled, not by ad-hoc devised ways if we can't control it.

先檢視 commit 96f7f942f3021b4154a5da14bbd7680c1e080200，並追蹤它所變更的計時器取消路徑。該 issue 未提供檔案或測試名稱；當一般機制能可靠地判定已觸發的 timeout 是否已取消，包括涉及 lock 的情況時，即表示完成。

由索引模型根據 Issue 內容生成。