Don't run stack delete in overcloud delete

Currently in "overcloud delete" we try to delete heat stack,
In patch[1] we added a rescue block for "Delete heat stack" task
to not fail even if we are not able to delete a stack to handle
the new ephermal heat stack case.

But user still get an intermidiate keystone exception about heat
endpoints not available[2], afterwards we print "this might be okay"
based on deployment, but this is a bit hostile for the user .

Also for ephermal heat case, we can speed up the "overcloud delete"
execution by not trying heat stack delete at all.

With tripleoclient patch[3] adding a new argument `--heat-type`
in "overcloud delete" command that will default to `pod` (ephermal
heat) and based on input we will set a var `heat_stack_delete`
that will decide whether to run heat stack delete at all.

Reverting the original "Delete heat stack" task prior to [1]
with a conditional when based on `heat_stack_delete` var.

[1] https://review.opendev.org/c/openstack/tripleo-ansible/+/807264
[2] https://bugs.launchpad.net/tripleo/+bug/1938618/comments/2
[3] https://review.opendev.org/c/openstack/python-tripleoclient/+/808539

Related-bug: #1938618
Change-Id: I9c7b11df6ac9a6a58bf3f4175d94095e0ef23fcf

tripleo_ansible/playbooks/cli-overcloud-delete.yaml

@@ -45,22 +45,15 @@
     - name: Delete OVN MAC Address ports
       tripleo_ovn_mac_addresses:
         stack_name: "{{ stack_name }}"
-    - name: Heat block
-      block:
-        - name: Delete heat stack
-          openstack.cloud.stack:
-            name: "{{ stack_name }}"
-            state: absent
-          register: stack_delete
-          until: stack_delete is success
-          delay: 5
-          retries: 3
-      rescue:
-        - name: Notice
-          debug:
-            msg: >-
-              The Heat stack for "{{ stack_name }}" was not deleted,
-              depending on the deployment type this may be normal.
+    - name: Delete heat stack
+      openstack.cloud.stack:
+        name: "{{ stack_name }}"
+        state: absent
+      register: stack_delete
+      until: stack_delete is success
+      delay: 4
+      retries: 16
+      when: heat_stack_delete|default(false)
     - name: Remove the config download stack
       file:
         path: "{{ config_download_path }}/{{ stack_name }}"