Fix issues with Datasets preview

[thepsalmist]

The CKAN Datastore extension provides a database that allows us to upload dataset resources, that can the be automatically previewed and automatically provides a Data API for search, filter and updating datasets etc.

On auditing the current datasets, there were few issues

1. Only datasets upload via the API and explicitly making a call to resource_create,e.g sensors.Africa datasets were automatically uploaded to the datastore and had preview + Data API as below
2. Datasets created manually via the create datasets form do not automatically upload to the datastore and therefore not available for previews. We are currently using the legacy Datapusher , however CKAN recommends upgrading to either of the plugins here for automatic datasets upload
3. We had a Cloudflare WAF rule to manage bot requests to the /datasets endpoint (temporarily disabled), however this is called when previewing. With Cloudflare raises a 403, so we need a workaround