Cleanup net integration test case for network modules (#34684)

*  Remove platform agnostic net_* test cases.
*  Add minimal platform agnostic test cases to individual
   platform-specific test cases

test/integration/targets/ios_interface/tests/cli/net_interface.yaml

@@ -0,0 +1,80 @@
+---
+- debug: msg="START ios cli/net_interface.yaml on connection={{ ansible_connection }}"
+
+# Add minimal testcase to check args are passed correctly to
+# implementation module and module run is successful.
+
+- name: Run show version
+  ios_command:
+    commands: show version
+    authorize: yes
+  register: show_version_result
+
+- block:
+    - name: Set test interface to GigabitEthernet0/1 as we are on Cisco IOS
+      set_fact: test_interface=GigabitEthernet0/1
+    - name: Set test interface 2 to GigabitEthernet0/2 as we are on Cisco IOS
+      set_fact: test_interface2=GigabitEthernet0/2
+  when: "'Cisco IOS' in show_version_result.stdout[0]"
+
+- block:
+    - name: Set test interface to GigabitEthernet2 as we are on Cisco IOS-XE
+      set_fact: test_interface=GigabitEthernet2
+    - name: Disable autonegotiation on GigabitEthernet2
+      ios_config:
+        lines:
+          - no negotiation auto
+        parents: int GigabitEthernet2
+        authorize: yes
+
+    - name: Set test interface 2 to GigabitEthernet3 as we are on Cisco IOS-XE
+      set_fact: test_interface2=GigabitEthernet3
+    - name: Disable autonegotiation on GigabitEthernet3
+      ios_config:
+        lines:
+          - no negotiation auto
+        parents: int GigabitEthernet3
+        authorize: yes
+  when: "'Cisco IOS-XE' in show_version_result.stdout[0]"
+
+- name: Configure interface (setup)
+  net_interface:
+    name: "{{ test_interface }}"
+    description: test-interface-1
+    speed: 1000
+    mtu: 1800
+    state: present
+    authorize: yes
+  register: result
+
+- name: Configure interface using platform agnostic module
+  net_interface:
+    name: "{{ test_interface }}"
+    description: test-interface-initial
+    state: present
+    authorize: yes
+  register: result
+
+- assert:
+    that:
+      - 'result.changed == true'
+      - '"interface {{ test_interface }}" in result.commands'
+      - '"description test-interface-initial" in result.commands'
+
+- name: Confgure interface parameters using platform agnostic module
+  net_interface:
+    name: "{{ test_interface }}"
+    description: test-interface
+    mtu: 2000
+    state: present
+    authorize: yes
+  register: result
+
+- assert:
+    that:
+      - 'result.changed == true'
+      - '"interface {{ test_interface }}" in result.commands'
+      - '"description test-interface" in result.commands'
+      - '"mtu 2000" in result.commands'
+
+- debug: msg="START ios cli/net_interface.yaml on connection={{ ansible_connection }}"