fix(relayer): revert func WaitConfirmations should not wait forever for ethereum.NotFound

[xiaodino]

Reverts #16547

Synced with @cyberhorsey offline.

The context has a timeout
It will hit the case <-ctx.Done(): and return, after the contet's timeout
not the ethereum RPC's timeout.
ctx, cancelFunc := context.WithTimeout(ctx, time.Duration(p.confTimeoutInSeconds)*time.Second)

[cyberhorsey]

needs title change