add gocritic/ruleguard checks back again, cleanup code. (#13665)

- remove some duplicated code
- reported a bug, separately fixed in #13664
- using strings.ReplaceAll() when needed
- using filepath.ToSlash() use when needed
- remove all non-Go style comments from the codebase

Co-authored-by: Aditya Manthramurthy <donatello@users.noreply.github.com>

internal/bucket/bandwidth/monitor.go

@@ -42,7 +42,7 @@ type Monitor struct {
 	NodeCount             uint64
 }
 
-//NewMonitor returns a monitor with defaults.
+// NewMonitor returns a monitor with defaults.
 func NewMonitor(ctx context.Context, numNodes uint64) *Monitor {
 	m := &Monitor{
 		activeBuckets:         make(map[string]*bucketMeasurement),
@@ -63,7 +63,7 @@ func (m *Monitor) updateMeasurement(bucket string, bytes uint64) {
 	}
 }
 
-//SelectionFunction for buckets
+// SelectionFunction for buckets
 type SelectionFunction func(bucket string) bool
 
 // SelectBuckets will select all the buckets passed in.