MM-16796: reduce plugin job interval to once per day (#11521)

* MM-16796: reduce plugin job interval to once per day

The Jobs infrastructure isn't currently setup for running frequent jobs,
as it spams the Jobs table with useless records. Update the plugin job
interval to run less frequently -- since the cleanup doesn't affect
semantics anyway -- and clean up the previously created entries in the Jobs table.

store/sqlstore/upgrade.go

@@ -699,6 +699,9 @@ func UpgradeDatabaseToVersion512(sqlStore SqlStore) {
 
 func UpgradeDatabaseToVersion513(sqlStore SqlStore) {
 	if shouldPerformUpgrade(sqlStore, VERSION_5_12_0, VERSION_5_13_0) {
+		// The previous jobs ran once per minute, cluttering the Jobs table with somewhat useless entries. Clean that up.
+		sqlStore.GetMaster().Exec("DELETE FROM Jobs WHERE Type = 'plugins'")
+
 		saveSchemaVersion(sqlStore, VERSION_5_13_0)
 	}
 }