added BRD intake-sites test

[sethdarragile6]

Updated the swagger spec to include an intake-sites test to the Lighthouse BRD suite

Summary

• This work is behind a feature toggle (flipper): NO
• Updated the swagger spec to include an intake-sites test to the Lighthouse BRD suite
• Disability Benefits Experience Team 1 (DBEX-TREX 🦖)

Related issue(s)

• #78798

Testing done

• All tests passing

Acceptance criteria

• I fixed|updated|added unit tests and integration tests for each feature (if applicable).
• No error nor warning in the console.
• Events are being sent to the appropriate logging solution
• Documentation has been updated (link to documentation)
• No sensitive information (i.e. PII/credentials/internal URLs/etc.) is captured in logging, hardcoded, or specs
• Feature/bug has a monitor built into Datadog or Grafana (if applicable)
• If app impacted requires authentication, did you login to a local build and verify all authenticated routes work as expected
• I added a screenshot of the developed feature

Requested Feedback

(OPTIONAL)What should the reviewers know in addition to the above. Is there anything specific you wish the reviewer to assist with. Do you have any concerns with this PR, why?