What are the relevant tickets?

Part of https://github.com/mitodl/hq/issues/9943.

Description (What does it do?)

This PR adds a dimensional-layer-backed mart for OCW resources, replacing the Superset dataset that currently reads int__ocw__resources directly. It adds dim_ocw_resource (one row per course_uuid/resource_uuid, sourced from int__ocw__resources) and marts__ocw_resources (references only the dimensional layer, not int__*). It also surfaces nine fields from the raw resource metadata JSON as scalar columns: resource_license, resource_description, resource_file_type, resource_file_size, resource_ocw_type, resource_audience, resource_level, external_resource_status, external_resource_wayback_url, and drops the raw metadata blob from the dim/mart. A few of these (audience, level, wayback_url) are currently sparse, but are expected to be filled in over time.

How can this be tested?

First, run

uv run dbt run \
  --select +marts__ocw_resources \
  --full-refresh \
  --vars 'schema_suffix: <your name>' \
  --project-dir src/ol_dbt/ \
  --profiles-dir src/ol_dbt/ \
  --target dev_production

filling in <your name> as appropriate.

Then, run

uv run dbt test \
  --select int__ocw__resources dim_ocw_resource marts__ocw_resources \
  --vars 'schema_suffix: <your name>' \
  --project-dir src/ol_dbt/ \
  --profiles-dir src/ol_dbt/ \
  --target dev_production

Finally, smoke-test this in Starburst Galaxy (https://mitol.galaxy.starburst.io/query-editor) by running a query such as

select
    course_number,
    course_title,
    resource_title,
    content_type,
    resource_license,
    resource_file_type,
    external_resource_status,
    external_resource_is_broken
from ol_data_lake_production.ol_warehouse_production_<your name>_mart.marts__ocw_resources
order by course_number
limit 20;