Add Data Connectors API documentation (3 endpoints)

[ellicenelson]

API Changes Description

What Changed

Add Data Connectors API documentation — 3 new endpoints, 4 schemas, 1 tag added to the Unstable spec.

Endpoints:

• GET /data_connectors — List all data connectors
• GET /data_connectors/{id}/execution_results — List execution results (paginated, filterable)
• GET /data_connectors/{id}/execution_results/{id} — Show single execution result with bodies

Upstream PRs:

• PR1: List Data Connectors — https://github.com/intercom/intercom/pull/468888
• PR2: List Execution Results — https://github.com/intercom/intercom/pull/470092
• PR3: Show Endpoint + Bodies + Request URL — https://github.com/intercom/intercom/pull/472131

Related PRs:

• Make OAuth scope public — intercom#472811
• Developer docs — developer-docs#736

API Versions Affected

• Unstable

_{Generated with Claude Code}

[ellicenelson]

Structure has validated against curls