Fix remote_tmp tests so that they actually use the remote_tmp (#80969)

* Fix remote_tmp tests so that they actually use the remote_tmp

* Isolate remote_tmp dir during remote_tmp tests. Fixes #80965

* Do everything without become

test/integration/targets/remote_tmp/playbook.yml

@@ -30,10 +30,22 @@
 - name: Test tempdir is removed
   hosts: testhost
   gather_facts: false
+  vars:
+    # These tests cannot be run with pipelining as it defeats the purpose of
+    # ensuring remote_tmp is cleaned up. Pipelining is enabled in the test
+    # inventory
+    ansible_pipelining: false
+    # Ensure that the remote_tmp_dir we create allows the unpriv connection user
+    # to create the remote_tmp
+    ansible_become: false
   tasks:
     - import_role:
         name: ../setup_remote_tmp_dir
 
+    - vars:
+        # Isolate the remote_tmp used by these tests
+        ansible_remote_tmp: "{{ remote_tmp_dir }}/remote_tmp"
+      block:
         - file:
             state: touch
             path: "{{ remote_tmp_dir }}/65393"
@@ -44,7 +56,7 @@
             remote_src: true
 
         - find:
-        path: "~/.ansible/tmp"
+            path: "{{ ansible_remote_tmp }}"
             use_regex: yes
             patterns: 'AnsiballZ_.+\.py'
             recurse: true
@@ -55,5 +67,6 @@
 
     - assert:
         that:
-          # Should find nothing since pipelining is used
-          - result.files|length == 0
+          # Should only be AnsiballZ_find.py because find is actively running
+          - result.files|length == 1
+          - result.files[0].path.endswith('/AnsiballZ_find.py')