v8.0 module release (#22975)

https://mattermost.atlassian.net/browse/MM-52079

```release-note
We upgrade the module version to 8.0. The new module path is github.com/mattermost-server/server/v8.
```


Co-authored-by: Doug Lauder <wiggin77@warpmail.net>

server/plugin/scheduler/scheduler.go

@@ -0,0 +1,20 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package scheduler
+
+import (
+	"time"
+
+	"github.com/mattermost/mattermost-server/server/v8/channels/jobs"
+	"github.com/mattermost/mattermost-server/server/v8/model"
+)
+
+const schedFreq = 24 * time.Hour
+
+func MakeScheduler(jobServer *jobs.JobServer) model.Scheduler {
+	isEnabled := func(cfg *model.Config) bool {
+		return true
+	}
+	return jobs.NewPeriodicScheduler(jobServer, model.JobTypePlugins, schedFreq, isEnabled)
+}