[BUG] Cleanup references to same and notSameLabels once Tenancy API is finalized

[tssurya]

What happened:

We are replacing same and notSameLabels with our new TenancyAPI in #122. We removed the old API here: #196. There are still some spots we need to cleanup once we know how to acheive tenancy in new API. These are:

1. https://github.com/kubernetes-sigs/network-policy-api/blob/main/site-src/blog/posts/Getting%20Started%20with%20ANP.md
2. https://network-policy-api.sigs.k8s.io/user-stories/
3. NetPol Assissant references

What you expected to happen:

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:

[tssurya]

/assign @npinaeva
/assign @huntergregory

[huntergregory]

See #212 for Policy Assistant changes

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