[PLAT-15952] cgroup values not getting updated on resize

Summary:
we all assumed this was checked once for the whole block. But, it is checked before ansible executes
every task in the block.
What this means is we do the first set_fact that will set systemd_dir to /etc/systemd/system. Now that
it is set, we drop out of the rest of the block because the where clause is no longer true

we now will always try to set systemd_dir, like other playbooks

Test Plan:
did a resize with cgroup size change. Validated correct cgroup service file gets updated, along with
the related sysfs cgroup file.

Reviewers: daniel, nbhatia, dnolan, svarshney, tsinghania

Reviewed By: svarshney, tsinghania

Subscribers: yugaware

Differential Revision: https://phorge.dev.yugabyte.com/D39682

managed/devops/roles/setup-cgroup/tasks/main.yml

@@ -20,14 +20,16 @@
     stat:
       path: "{{ yb_home_dir | default('/home/yugabyte') }}/.config/systemd/user/"
     register: systemd_user
+  - name: Print systemd_user
+    debug:
+      var: systemd_user
 
   - block:
     - set_fact:
         systemd_dir: "/etc/systemd/system"
     - set_fact:
         systemd_dir: "{{ yb_home_dir | default('/home/yugabyte') }}/.config/systemd/user"
       when: systemd_user.stat.exists
-    when: systemd_dir is undefined
 
   - name: check for cgconfig service
     ansible.builtin.shell:
@@ -76,7 +78,7 @@
       owner: "{{ user_name }}"
       group: "{{ user_name }}"
       mode: 0644
-  - name: Run Cgroup oneshot service
+  - name: Run Cgroup oneshot service user systemd
     become: true
     become_user: "{{ user_name }}"
     ansible.builtin.systemd:
@@ -85,6 +87,16 @@
       name: yb-ysql-cgroup
       state: started
       enabled: true
+    when: systemd_user.stat.exists
+  - name: Run Cgroup oneshot service root systemd
+    become: true
+    become_user: "{{ user_name }}"
+    ansible.builtin.systemd:
+      daemon_reload: yes
+      name: yb-ysql-cgroup
+      state: started
+      enabled: true
+    when: not systemd_user.stat.exists
 
   when: systemd_option and pg_max_mem_mb > 0 and ansible_distribution_major_version == "9"