fix: batch status reporting after complete (#17852)

batch status can perpetually wait after completion
due to a race between the MetricsHandler() returning
the active metrics in intervals of 1sec and delete
of metrics after job completion.

this PR ensures that we keep the 'status' around
for a while, i.e upto 24hrs for all the batch jobs.

cmd/common-main.go

@@ -95,6 +95,9 @@ func init() {
 
 	initGlobalContext()
 
+	globalBatchJobsMetrics = batchJobMetrics{metrics: make(map[string]*batchJobInfo)}
+	go globalBatchJobsMetrics.purgeJobMetrics()
+
 	t, _ := minioVersionToReleaseTime(Version)
 	if !t.IsZero() {
 		globalVersionUnix = uint64(t.Unix())