iosxr tests: Initial work for 2.3 (#20883)

Ensure a loopback device exists for testing
Remove provider:
Default is to run task on Network, device, use delegate_to: localhost for local tasks.

test/integration/targets/iosxr_config/tasks/cli.yaml

@@ -4,6 +4,7 @@
     paths: "{{ role_path }}/tests/cli"
     patterns: "{{ testcase }}.yaml"
   register: test_cases
+  delegate_to: localhost
 
 - name: set test_items
   set_fact: test_items="{{ test_cases.files | map(attribute='path') | list }}"