Migrate NIC sample

https://github.com/Azure-Samples/network-go-manage-network-interface

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## This issue is a: (mark with an `x`)

- [ ] bug report
- [ ] request for new sample
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

## Steps to reproduce:

## Errors and log messages:

## Expected behavior:

## OS and Go versions:

## Further info:

Start by reviewing the linked network interface sample and the azure-sdk-for-go-samples repository to determine what migration is requested. Confirm the target sample location, migration scope, and completion criteria before making changes; the issue provides no named files or tests.

Written by the indexing model from the issue text.