[CU-86bcf3q9q] Look up a table's data model in the request's tenant

[jstromsky]

What changed

data-connect-trino now looks up a table's stored data model in the tenant of the request.

• A request in a non-management tenant calls GET /tenants/{tenantId}/collection/{schema}/item/{table} on collection-service. It uses a token for that tenant (TokenTenantPolicy.tenantFromRequestPath()).
• A request in the management tenant keeps the old path and the management token. This keeps it working against a collection-service that does not serve /tenants/{tenantId}/... yet (see collection-service PR #583).
• DataModelSupplier.supply now takes the TenantId as its first parameter. TrinoDataConnectAdapter passes the tenant of the request. The indexing-service and tables-registry suppliers ignore it, as before.
• If no token can be obtained for the tenant, the lookup returns no data model and the service falls back to Trino. Before this change, the error reached the caller.

Why

Before this change, every lookup ran as the management tenant. A tenant could receive a data model that is stored in the management tenant.

What this does not change

In production, collection-service refuses this lookup today. It answers 403 insufficient_scope, because the endpoint requires the collection:read permission and data-connect-trino only holds collection_item:read. So every caller already gets the Trino fallback. This PR does not add the permission. The lookup was found in the production logs only 6 times since 1 January 2026. Callers will see no difference after this PR. The routing is now correct if the permission is added later.

How it was tested

• New unit tests in CollectionServiceDataModelSupplierTest: a tenant uses the tenant path, management uses the old path, other catalogs are skipped, and a failed token request falls back.
• Mutation check: routing every lookup to one client makes the tests fail. Removing the new catch makes the token test fail.
• All 147 unit tests pass, including TenancyArchitectureTest.

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