GODT-1431 Prevent watcher when not using disk on cache

- change: Rename Cacher -> MsgCachePool
- change: Do not run watcher when using memory cache
- add: Allow to cancel cacher jobs (added context)
- change: Fix behavior on context cancel (was causing no internet)

pkg/pmapi/response.go

@@ -18,6 +18,7 @@
 package pmapi
 
 import (
+	"context"
 	"math/rand"
 	"net/http"
 	"strconv"
@@ -141,6 +142,10 @@ func wrapNoConnection(res *resty.Response, err error) (*resty.Response, error) {
 		return res, err
 	}
 
+	if errors.Is(err, context.Canceled) {
+		return res, err
+	}
+
 	if res.RawResponse != nil {
 		return res, err
 	}