re-use transport and set stronger backwards compatible Ciphers (#19565)

This PR fixes a few things

- FIPS support for missing for remote transports, causing
  MinIO could end up using non-FIPS Ciphers in FIPS mode

- Avoids too many transports, they all do the same thing
  to make connection pooling work properly re-use them.

- globalTCPOptions must be set before setting transport
  to make sure the client conn deadlines are honored properly.

- GCS warm tier must re-use our transport

- Re-enable trailing headers support.

cmd/admin-handlers.go

@@ -2376,7 +2376,7 @@ func getKubernetesInfo(dctx context.Context) madmin.KubernetesInfo {
 	}
 
 	client := &http.Client{
-		Transport: globalHealthChkTransport,
+		Transport: globalRemoteTargetTransport,
 		Timeout:   10 * time.Second,
 	}