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_command/tests/cli/invalid.yaml

@@ -4,7 +4,6 @@
 - name: run invalid command
   iosxr_command:
     commands: ['show foo']
-    provider: "{{ cli }}"
   register: result
   ignore_errors: yes
 
@@ -17,7 +16,6 @@
     commands:
       - show version
       - show foo
-    provider: "{{ cli }}"
   register: result
   ignore_errors: yes