[BACKPORT 2.18.3][PLAT-10527] Reverting systemd reboot workaround

Summary:
Issues were seen after adding systemd reboot workaround to set ulimits on RHEL8 user mode systemd
setups. The reboot would get run unintentionally on YBC upgrades or systemd upgrades and could
potentially cause downtime as all the nodes would go down. This diff reverts all the changes while
we figure out a more correct fix.

Original diff: eaa4e16 / D29103
This reverts commit d2e6e12.
This reverts commit 5cd5e7b.

Test Plan: Run systemd upgrade and YBC install during software upgrade, make sure there is no reboot.

Reviewers: svarshney, amalyshev, vbansal, nbhatia

Reviewed By: nbhatia

Subscribers: yugaware

Differential Revision: https://phorge.dev.yugabyte.com/D29170

managed/devops/roles/provision-cluster-server/tasks/main.yml

@@ -142,37 +142,6 @@
       become_method: sudo
       shell:
         cmd: "loginctl enable-linger {{ user_name }}"
-
-    - block:
-      - name: Set ulimits for user scope in system.conf
-        lineinfile:
-          dest: /etc/systemd/system.conf
-          regexp: '^DefaultLimitNOFILE*'
-          line: 'DefaultLimitNOFILE=1048576'
-          create: yes
-          state: present
-          insertafter: 'EOF'
-
-      - name: Set ulimits for user scope in user.conf
-        lineinfile:
-          dest: /etc/systemd/user.conf
-          regexp: '^DefaultLimitNOFILE*'
-          line: 'DefaultLimitNOFILE=1048576'
-          create: yes
-          state: present
-          insertafter: 'EOF'
-
-      - name: Reboot the system for new ulimits
-        reboot:
-          pre_reboot_delay: 60
-          post_reboot_delay: 60
-          reboot_timeout: 300
-        register: reboot
-
-      - name: Log reboot time
-        debug:
-          msg: System took {{ reboot.elapsed }} seconds to reboot
-      when: ansible_os_family == 'RedHat' and ansible_distribution_major_version == '8'
     # Do not configure user scope for setting up systemd in centos7/amazonLinux:2.
     when: ansible_os_family != 'RedHat' or (ansible_distribution_major_version != '7' and not (ansible_distribution == 'Amazon' and ansible_distribution_major_version == '2'))
   - block:
@@ -242,8 +211,7 @@
         line: "#includedir /etc/sudoers.d"
         state: present
         validate: "/usr/sbin/visudo -cf %s"
-      when: (ansible_os_family == 'RedHat' and ansible_distribution_major_version == '7') or
-            (ansible_os_family == 'Amazon' and ansible_distribution_major_version == '2')
+      when: ansible_os_family == 'RedHat' and ansible_distribution_major_version == '7'
 
   - name: setup-postgres-cgroups
     include_role: