Migrate channel_store to sqlx (#19247)

* Migrate channel_store to sqlx

https://community-daily.mattermost.com/boards/workspace/zyoahc9uapdn3xdptac6jb69ic/285b80a3-257d-41f6-8cf4-ed80ca9d92e5/495cdb4d-c13a-4992-8eb9-80cfee2819a4/chur9rxkghprg7dz1mcqssj34ic

```release-note
NONE
```

store/storetest/channel_store.go

@@ -453,6 +453,10 @@ func testChannelStoreGet(t *testing.T, ss store.Store, s SqlStore) {
 	require.NoError(t, err, err)
 	require.Greater(t, len(channelsTeam), 0, "too little")
 
+	_, err = ss.Channel().GetTeamChannels("notfound")
+	var nfErr *store.ErrNotFound
+	require.True(t, errors.As(err, &nfErr))
+
 	// Manually truncate Channels table until testlib can handle cleanups
 	s.GetMaster().Exec("TRUNCATE Channels")
 }