Migrate to stateless app.App (#17542)

* add request context

* move initialialization to server

* use app interface instead of global app functions

* remove app context from webconn

* cleanup

* remove duplicated services

* move context to separate package

* remove finalize init method and move content to NewServer function

* restart workers and schedulers after adding license for tests

* reflect review comments

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

api4/bleve.go

@@ -18,7 +18,7 @@ func purgeBleveIndexes(c *Context, w http.ResponseWriter, r *http.Request) {
 	auditRec := c.MakeAuditRecord("purgeBleveIndexes", audit.Fail)
 	defer c.LogAuditRec(auditRec)
 
-	if !c.App.SessionHasPermissionTo(*c.App.Session(), model.PERMISSION_PURGE_BLEVE_INDEXES) {
+	if !c.App.SessionHasPermissionTo(*c.AppContext.Session(), model.PERMISSION_PURGE_BLEVE_INDEXES) {
 		c.SetPermissionError(model.PERMISSION_PURGE_BLEVE_INDEXES)
 		return
 	}