PortalJS Cloud Portal-Specific API endpoints

[demenech]

As a portal administrator, I'd like to have portal-aware API endpoints, e.g, api.cloud.portaljs.com/my-portal/api/3/action/package_search, so that I can more easily interact programatically with my portal.

This improvement also helps with:

• Simplifying the PortalJS Frontend Starter Template codebase by removing the need for a custom PortalJS Cloud connector (it will be possible to use just a plain CKAN connector)
• Simplifying the code for custom data pipelines (e.g., with the PortalJS Harvesters Framework)

Acceptance Criteria

• The API endpoints that are relevant to the PortalJS Frontend Starter Template have been identified (e.g, package_search, group_list, etc.)
  • ... and support portal-awareness
• (Bonus) The API endpoints that are relevant to data pipelines have been identified (e.g., organization_create, package_create, etc.)
  • ... and support portal-awareness

Tasks

• Investigate the most relevant API endpoints
• Decide on an approach for making these endpoints portal-aware
  • Ideally, /my-portal/api/3/action/... for full compatibility with the CKAN core API
  • Redundancy is also good, e.g, also make the core endpoints portal-aware via headers
  • NOTE: core endpoints must still behave as they behave currently for retrocompatibility and smooth migration
• Implement

[demenech]

Read-only portal-scoped API endpoints have been deployed to prod, without affecting the old portals (NOTE: search facet values haven't been fixed, I have to think of a new strategy to accomplish this)

PRs:

• ckanext-cloud (https://github.com/datopian/ckanext-cloud/pull/12) - Helpers for portal-scoped API endpoints + Portal-scoped *_list, *_show and *_activity_list
• portaljs-frontend-starter (PortalJS Cloud portal-scoped APIs portaljs-frontend-starter#22) - Removed multitenancy business logic
• cloud.portaljs.com (https://github.com/datopian/cloud.portaljs.com/pull/111) - NEXT_PUBLIC_ORG is no longer set on portal deployments

✔️ Old portals still working as before, no breaking changes

✔️ Newly created portal working with the new endpoints:

• Test portal: https://portal-scoped-api.portaljs.com/
• Test portal API docs: https://api.cloud.portaljs.com/@portal-scoped-api/api/3/docs
• Test portal package_search: https://api.cloud.portaljs.com/@portal-scoped-api/api/3/action/package_search

Pending

*_create, *_update, *_patch endpoints

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CC: @willy1989cv @steveoni @anuveyatsu