speedup getFormatErasureInQuorum use driveCount (#14239)

startup speed-up, currently getFormatErasureInQuorum()
would spend up to 2-3secs when there are 3000+ drives
for example in a setup, simplify this implementation
to use drive counts.

cmd/erasure-sets.go

@@ -1211,6 +1211,9 @@ func formatsToDrivesInfo(endpoints Endpoints, formats []*formatErasureV3, sErrs
 // If it is a single node Erasure and all disks are root disks, it is most likely a test setup, else it is a production setup.
 // On a test setup we allow creation of format.json on root disks to help with dev/testing.
 func isTestSetup(infos []DiskInfo, errs []error) bool {
+	if globalIsCICD {
+		return true
+	}
 	rootDiskCount := 0
 	for i := range errs {
 		if errs[i] == nil || errs[i] == errUnformattedDisk {
@@ -1245,6 +1248,9 @@ func getHealDiskInfos(storageDisks []StorageAPI, errs []error) ([]DiskInfo, []er
 
 // Mark root disks as down so as not to heal them.
 func markRootDisksAsDown(storageDisks []StorageAPI, errs []error) {
+	if globalIsCICD {
+		return
+	}
 	var infos []DiskInfo
 	infos, errs = getHealDiskInfos(storageDisks, errs)
 	if !isTestSetup(infos, errs) {