This is a change to the regression tests only. These tests were failing because of leftover device settings from previous tests:
- existing `channel-group` configurations on non-test interfaces were included in the before/after counts
- fixed by using the `nxos_lag_interfaces` module with `state: deleted` to remove `channel-group` configur
ations from all interfaces
- existing `L2` `port-channel` interfaces with the same ID as the test `channel-group` ID may prevent configuring `channel-group` on the test ethernet interface
- fixed by removing `port-channel` interfaces with the same ID; e.g.
```
interface port-channel98
switchport
switchport mode trunk
nx-1(config-if)# interface Ethernet1/19
nx-1(config-if)# channel-group 98
command failed: port not compatible [switching port]
```
Fixes passed on `N6K,N7K,N9K,N3K` (internal TBs: `dt-n9k5-1,n6k-77,n7k-99,n7k-j,n3k-173,evergreen-nx-1,greensboro-nx-1,hamilton-nx-1,camden-nx-1`)
