sync: wait() may miss signal then cause deadlock

[davies]

There is a chance that Wait() may miss the signal from Signal(), then deadlock, we should always use WaitWithTimeout().

G1                        G2

read is false
Unlock
                            Lock
                            ready = true
                            select ch {
                            default:
                            }
<- ch (deadlock)

[github-actions]

Mutate Test Report
pkg/utils/cond_test.go-1-1: score:0.57 failed:3, passed:4, compile error:0, out of coverage:0, skip by comment:0, others:0
Job detail: https://github.com/juicedata/juicefs/actions/runs/5201968086/jobs/9382904152

Usage: https://github.com/juicedata/juicefs/blob/main/.github/scripts/mutate/how_to_use_mutate_test.md

[github-actions]

Mutate Test Report
pkg/utils/cond_test.go-1-1: score:0.57 failed:3, passed:4, compile error:0, out of coverage:0, skip by comment:0, others:0
Job detail: https://github.com/juicedata/juicefs/actions/runs/5207073993/jobs/9394279542

Usage: https://github.com/juicedata/juicefs/blob/main/.github/scripts/mutate/how_to_use_mutate_test.md