[PLAT-16142] Cgroup gflag set when only using user intent

Summary:
postmaster gflag needs to get set when cgroup size is provided
only in user intent, rather then also needing
runtime configs to be set.

Test Plan:
tested setting cgroup with user intent
tested setting cgroup with runtime flag
both succeeded

Reviewers: muthu, daniel

Reviewed By: daniel

Subscribers: yugaware

Differential Revision: https://phorge.dev.yugabyte.com/D40158

managed/src/main/java/com/yugabyte/yw/common/gflags/GFlagsUtil.java

@@ -318,14 +318,20 @@ public static Map<String, String> getAllDefaultGFlags(
     if (processType == null) {
       extra_gflags.put(MASTER_ADDRESSES, "");
     } else if (processType.equals(UniverseTaskBase.ServerType.TSERVER.name())) {
-      boolean configCgroup = config.getInt(NodeManager.POSTGRES_MAX_MEM_MB) > 0;
+      Integer cgroupSize = userIntent.getCGroupSize(node);
+      boolean configCgroup =
+          (cgroupSize != null && cgroupSize > 0)
+              || config.getInt(NodeManager.POSTGRES_MAX_MEM_MB) > 0;
 
       // If the cluster is a read replica, use the read replica max mem value if its >= 0. -1 means
       // to use the primary cluster value instead.
       if (universe.getUniverseDetails().getClusterByUuid(taskParam.placementUuid).clusterType
               == UniverseDefinitionTaskParams.ClusterType.ASYNC
-          && confGetter.getStaticConf().getInt(NodeManager.POSTGRES_RR_MAX_MEM_MB) >= 0) {
-        configCgroup = config.getInt(NodeManager.POSTGRES_RR_MAX_MEM_MB) > 0;
+          && ((cgroupSize != null && cgroupSize >= 0)
+              || confGetter.getStaticConf().getInt(NodeManager.POSTGRES_RR_MAX_MEM_MB) >= 0)) {
+        configCgroup =
+            userIntent.getCGroupSize(node) > 0
+                || config.getInt(NodeManager.POSTGRES_RR_MAX_MEM_MB) > 0;
       }
       long historyRetentionBufferSecs =
           confGetter.getConfForScope(