tests: Reproduce #15220 via manual progress notify

[serathius]

cc @ahrtr @wojtek-t @scpmw

[serathius]

ref #15220

[serathius]

Got a repro

panic: Revision should never decrease

goroutine 131 [running]:
go.etcd.io/etcd/tests/v3/linearizability.collectMemberWatchEvents({0x124d250, 0xc0000a6680}, 0x0?, 0xc000198000)
	/home/runner/work/etcd/etcd/tests/linearizability/watch.go:77 +0x7f8
go.etcd.io/etcd/tests/v3/linearizability.collectClusterWatchEvents.func1(0x0, 0x0?)
	/home/runner/work/etcd/etcd/tests/linearizability/watch.go:50 +0xc5
created by go.etcd.io/etcd/tests/v3/linearizability.collectClusterWatchEvents
	/home/runner/work/etcd/etcd/tests/linearizability/watch.go:47 +0x4cd
FAIL	go.etcd.io/etcd/tests/v3/linearizability	0.985s

[serathius]

Verified that it also reproduces on v3.4.23

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed after 21 days if no further activity occurs. Thank you for your contributions.

[serathius]

Issue fixed now