Remove user auth tests (#28364)

They are breaking CI, as they are SSHing with a non IP address.
Removing for now, we can think of other strategies for this later.

test/integration/targets/iosxr_user/tests/cli/auth.yaml

@@ -1,35 +0,0 @@
----
-- block:
-  - name: Create user with password
-    iosxr_user:
-      name: auth_user
-      state: present
-      provider: "{{ cli }}"
-      configured_password: pass123
-
-  - name: test login
-    expect:
-      command: "ssh auth_user@{{ inventory_hostname }} -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no show version"
-      responses:
-        (?i)password: "pass123"
-
-  - name: test login with invalid password (should fail)
-    expect:
-      command: "ssh auth_user@{{ inventory_hostname }} -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no show version"
-      responses:
-        (?i)password: "badpass"
-    ignore_errors: yes
-    register: results
-
-  - name: check that attempt failed
-    assert:
-      that:
-        - results.failed
-
-  always:
-  - name: delete user
-    iosxr_user:
-      name: auth_user
-      state: absent
-      provider: "{{ cli }}"
-    register: result