Revert "Remove nodeSelector from k8s deployments (#2798)" (#2799)

This reverts commit 5cef2dd8b5.
We faced CPU quota issue with standard machine type, so rolling back to c4
for now to monitor server performance and decide if we want to try to
downgrade again in the future.

jetty/kubernetes/nomulus-backend.yaml

@@ -14,6 +14,9 @@ spec:
         service: backend
     spec:
       serviceAccountName: nomulus
+      nodeSelector:
+        cloud.google.com/compute-class: "Performance"
+        cloud.google.com/machine-family: c4
       containers:
       - name: backend
         image: gcr.io/GCP_PROJECT/nomulus
@@ -22,15 +25,9 @@ spec:
           name: http
         resources:
           requests:
-            # explicit pod-slots 0 is required in order to downgrade node
-            # class from performance, which has implicit pod-slots 1
-            cloud.google.com/pod-slots: 0
             cpu: "500m"
             memory: "1Gi"
           limits:
-            # explicit pod-slots 0 is required in order to downgrade node
-            # class from performance, which has implicit pod-slots 1
-            cloud.google.com/pod-slots: 0
             cpu: "1000m"
             memory: "1Gi"
         args: [ENVIRONMENT]

jetty/kubernetes/nomulus-frontend.yaml

@@ -14,6 +14,9 @@ spec:
         service: frontend
     spec:
       serviceAccountName: nomulus
+      nodeSelector:
+        cloud.google.com/compute-class: "Performance"
+        cloud.google.com/machine-family: c4
       containers:
       - name: frontend
         image: gcr.io/GCP_PROJECT/nomulus
@@ -22,15 +25,9 @@ spec:
           name: http
         resources:
           requests:
-            # explicit pod-slots 0 is required in order to downgrade node
-            # class from performance, which has implicit pod-slots 1
-            cloud.google.com/pod-slots: 0
             cpu: "1000m"
             memory: "1Gi"
           limits:
-            # explicit pod-slots 0 is required in order to downgrade node
-            # class from performance, which has implicit pod-slots 1
-            cloud.google.com/pod-slots: 0
             cpu: "1000m"
             memory: "2Gi"
         args: [ENVIRONMENT]
@@ -56,15 +53,9 @@ spec:
           name: epp
         resources:
           requests:
-            # explicit pod-slots 0 is required in order to downgrade node
-            # class from performance, which has implicit pod-slots 1
-            cloud.google.com/pod-slots: 0
             cpu: "1000m"
             memory: "512Mi"
           limits:
-            # explicit pod-slots 0 is required in order to downgrade node
-            # class from performance, which has implicit pod-slots 1
-            cloud.google.com/pod-slots: 0
             cpu: "1000m"
             memory: "512Mi"
         args: [--env, PROXY_ENV, --log, --local]