Fixes nxos_l2_interface tests (#34514)

* Update nxos tests that got missed in the first pass

* Add setup for setting interfaces to layer2

test/integration/targets/nxos_l2_interface/tests/common/agg.yaml

@@ -12,6 +12,13 @@
     vlan_range: "6,15"
     provider: "{{ connection }}"
 
+- name: Setup - Ensure interfaces are layer2
+  nxos_interface:
+    aggregate:
+      - { name: "{{ intname1 }}" }
+      - { name: "{{ intname2 }}" }
+    mode: layer2
+
 - name: Setup - Remove interface aggregate before testing
   nxos_l2_interface:
     aggregate:

test/integration/targets/nxos_l2_interface/tests/common/sanity.yaml

@@ -16,6 +16,11 @@
     provider: "{{ connection }}"
   ignore_errors: yes
 
+- name: Setup - Ensure interface is layer2
+  nxos_interface:
+    interface: "{{ intname }}"
+    mode: layer2
+
 - name: "Setup vlans"
   nxos_vlan:
     vlan_range: "5-10,20"