Remove unused and outdated Natural Language samples

[alixhami]

Removes unused and outdated tutorials and samples. Specifically:

• v1beta2/ folder because no samples are in beta
• Tutorials using googleapiclient.discovery

[nnegrey]

LGTM

@dizcology, what are your thoughts on this?

[dizcology]

@alixhami Please confirm that the samples with region tags (the beta samples) are not being used in the docs.

The three samples movie_nl, ocr_nl, and syntaxz_triples are tutorials that do not have equivalent samples using google-cloud-language. I would suggest keeping them for now.

[alixhami]

I confirmed that they are not being used in the docs.

Aren't the tutorials not using a currently recommended way of interacting with the API? What is in these tutorials that is missing from the docs? If there are gaps in the docs we should create content using google-cloud-language to address that.

[beccasaurus]

My recommendation would be to do away with all stale code using googleapiclient.discovery. It's confusing to users.

Also, out standard practice is:

if it's not in the docs (either cloud.google.com product pages or cloud.google.com/community) then it's safe to delete

If we want to keep code, it needs to be published somewhere

LGTM

[alixhami]

cc @beccasaurus

[beccasaurus]

🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥