refactor: reduce the number of cert-manager instances

In order to reduce the final bill + the fact that we recently moved to subdomains
+ the 2nd instance is consuming as much as the first one but in stand
by mode we can move to 1 instance only

src/cloud_provider/aws/kubernetes/helm_charts.rs

@@ -694,7 +694,7 @@ datasources:
                 },
                 ChartSetValue {
                     key: "replicaCount".to_string(),
-                    value: "2".to_string(),
+                    value: "1".to_string(),
                 },
                 // https://cert-manager.io/docs/configuration/acme/dns01/#setting-nameservers-for-dns01-self-check
                 ChartSetValue {

src/cloud_provider/digitalocean/kubernetes/helm_charts.rs

@@ -534,7 +534,7 @@ datasources:
                 },
                 ChartSetValue {
                     key: "replicaCount".to_string(),
-                    value: "2".to_string(),
+                    value: "1".to_string(),
                 },
                 // https://cert-manager.io/docs/configuration/acme/dns01/#setting-nameservers-for-dns01-self-check
                 ChartSetValue {

src/cloud_provider/scaleway/kubernetes/helm_charts.rs

@@ -483,7 +483,7 @@ datasources:
                 },
                 ChartSetValue {
                     key: "replicaCount".to_string(),
-                    value: "2".to_string(),
+                    value: "1".to_string(),
                 },
                 // https://cert-manager.io/docs/configuration/acme/dns01/#setting-nameservers-for-dns01-self-check
                 ChartSetValue {