Don't attempt to send transactions if Dendrite is shutting down (#3356)

This should avoid confusions with logs like:

```
time="2024-04-08T08:38:45.104235081Z" level=error msg="Failed to set \"scs.ems.host\" as assumed offline" func="github.com/matrix-org/dendrite/federationapi/statistics.(*ServerStatistics).Failure" file="github.com/matrix-org/dendrite/federationapi/statistics/statistics.go:204" error="sqlutil.WithTransaction.Begin: sql: database is closed"
time="2024-04-08T08:38:45.104239201Z" level=error msg="Failed to set \"obermui.de\" as assumed offline" func="github.com/matrix-org/dendrite/federationapi/statistics.(*ServerStatistics).Failure" file="github.com/matrix-org/dendrite/federationapi/statistics/statistics.go:204" error="sqlutil.WithTransaction.Begin: sql: database is closed"
```

or 

```
time="2024-04-08T08:38:45.105235411Z" level=error msg="Failed to get pending EDUs for \"retro76.net\"" func="github.com/matrix-org/dendrite/federationapi/queue.(*destinationQueue).getPendingFromDatabase" file="github.com/matrix-org/dendritefederationapi/queue/destinationqueue.go:258" error="sqlutil.WithTransaction.Begin: sql: database is closed"
```

[skip ci]
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Till 2024-04-09 07:49:56 +02:00 committed by GitHub
parent 8aa088f713
commit 5c0ceec2a6
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@ -294,6 +294,10 @@ func (oq *destinationQueue) checkNotificationsOnClose() {
// backgroundSend is the worker goroutine for sending events.
func (oq *destinationQueue) backgroundSend() {
// Don't try to send transactions if we are shutting down.
if oq.process.Context().Err() != nil {
return
}
// Check if a worker is already running, and if it isn't, then
// mark it as started.
if !oq.running.CompareAndSwap(false, true) {