goimports (#16640)

* format using `goimports -local github.com/mattermost/mattermost-server/v5 -w`

* added goimports lint check to .golangci.yml

* format using `goimports -local github.com/mattermost/mattermost-server/v5 -w` for a corner case

* make app-layers, *-mocks and store-layers for ci check

Co-authored-by: Mahmudul Haque <mahmudulhaque@protonmail.com>
Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

services/tracing/tracing.go

@@ -4,18 +4,17 @@
 package tracing
 
 import (
+	"context"
 	"io"
 	"time"
 
-	"github.com/mattermost/mattermost-server/v5/mlog"
 	opentracing "github.com/opentracing/opentracing-go"
-	"github.com/uber/jaeger-lib/metrics"
-
-	"context"
-
 	"github.com/uber/jaeger-client-go"
 	jaegercfg "github.com/uber/jaeger-client-go/config"
 	"github.com/uber/jaeger-client-go/zipkin"
+	"github.com/uber/jaeger-lib/metrics"
+
+	"github.com/mattermost/mattermost-server/v5/mlog"
 )
 
 // Tracer is a wrapper around Jaeger OpenTracing client, used to properly de-initialize jaeger on exit