Add Grafana as an access review connector-backed source.
This introduces a Grafana access-review driver, provider registration,
and connector settings for the Grafana base URL. It also wires the
new provider through GraphQL and access-review UI input mapping so
API-key connectors can be created from the product.
A connector_provider enum migration is included so Grafana can be
persisted in existing databases.
Signed-off-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Bryan FRIMIN <bryan@frimin.fr>
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