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/config/dns/operator_dns.go

@@ -201,9 +201,9 @@ func Authentication(username, password string) OperatorOption {
 }
 
 // RootCAs - add custom trust certs pool
-func RootCAs(CAs *x509.CertPool) OperatorOption {
+func RootCAs(certPool *x509.CertPool) OperatorOption {
 	return func(args *OperatorDNS) {
-		args.rootCAs = CAs
+		args.rootCAs = certPool
 	}
 }