[XYZ-6] Add sampledata platform command (#8027)

* Add fake dependency

* [XYZ-6] Add sampledata platform command

* Creating EMOJI_NAME_MAX_LENGTH as a constant and using it where needed

cmd/platform/mattermost.go

@@ -36,7 +36,7 @@ func init() {
 
 	resetCmd.Flags().Bool("confirm", false, "Confirm you really want to delete everything and a DB backup has been performed.")
 
-	rootCmd.AddCommand(serverCmd, versionCmd, userCmd, teamCmd, licenseCmd, importCmd, resetCmd, channelCmd, rolesCmd, testCmd, ldapCmd, configCmd, jobserverCmd, commandCmd, messageExportCmd)
+	rootCmd.AddCommand(serverCmd, versionCmd, userCmd, teamCmd, licenseCmd, importCmd, resetCmd, channelCmd, rolesCmd, testCmd, ldapCmd, configCmd, jobserverCmd, commandCmd, messageExportCmd, sampleDataCmd)
 }
 
 var rootCmd = &cobra.Command{