do not generate the cloud cred secret when credentialsMode is Manual

Indicating mode "Manual" means the user will be responsible for administering credentials to the components that need them.
And "Manual" mode can be used to install using temporary credentials (for AWS) for which there is no reason to place temporary credentials into the cluster that will never be updated.

pkg/asset/manifests/openshift.go

@@ -208,7 +208,9 @@ func (o *Openshift) Generate(dependencies asset.Parents) error {
 
 	switch platform {
 	case awstypes.Name, openstacktypes.Name, vspheretypes.Name, azuretypes.Name, gcptypes.Name, ovirttypes.Name:
-		assetData["99_cloud-creds-secret.yaml"] = applyTemplateData(cloudCredsSecret.Files()[0].Data, templateData)
+		if installConfig.Config.CredentialsMode != types.ManualCredentialsMode {
+			assetData["99_cloud-creds-secret.yaml"] = applyTemplateData(cloudCredsSecret.Files()[0].Data, templateData)
+		}
 		assetData["99_role-cloud-creds-secret-reader.yaml"] = applyTemplateData(roleCloudCredsSecretReader.Files()[0].Data, templateData)
 	case baremetaltypes.Name:
 		bmTemplateData := baremetalTemplateData{