photoslibrary: remove v1 client

The photoslibrary team hopes to fully support Go in the near future, but this
autogenerated library is ready to be sunset.

Removes the photoslibrary autogenerated client. Please note: as noted in our
README and at https://godoc.org/google.golang.org/api, though the API is
considered v1 and stable, all clients in this repository are considered beta.

If you rely on this client, please vendor this library.

Change-Id: Ia5521187d5c8d3b41b122cacf1b23d337628ceee
Reviewed-on: https://code-review.googlesource.com/c/google-api-go-client/+/39951
Reviewed-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Chris Broadfoot <cbro@google.com>