[DRAFT] Tinybird TYPE ENDPOINT definitions and add missing metadata

[general-adhoc]

This PR has two fixes to address issues encountered during local dev onboarding:

1. TinyBird launched the new Forward Workspace, and it appears you can no longer create new Classic Tinybird workspaces moving forward. I've updated the Dub docs to reflect this. See PR to update Dub Docs for full details on this issue.

TYPE ENDPOINT is supported by Tinybird Classic (docs link) and required by Tinybird Forward to publish a .pipe as an API endpoint. This updates existing endpoint pipes to use the explicit endpoint type while leaving materialized pipes unchanged. Classic inferred more from the workspace/UI while Forward workspaces are stricter about datafiles as source of truth.

2. Missing metadata on materialized pipe schema for partner_tag_ids in packages/tinybird/pipes/dub_links_metadata_pipe.pipe

Testing

• I was able to complete the full local environment setup and register clicks in TinyBird's clickhouse after making the changes in this PR to my local env.

NOTE: This was tested against a TinyBird FORWARD workspace, as I do not have the ability to create Classic workspaces. Dub's prod environment is a Classic workspace AFAIK.

Someone with access to prod TinyBird will need to run:

tb --cloud deployment create --check doc link

and ensure that this does not make any material changes + test these changes against a TinyBird Classic Workspace running a Dub Dev environment

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