Update Community District Filter and Add borough filter query parameter to `findCommunityBoardBudgetRequests` endpoint

[TylerMatteo]

Context

See this section in #549 for context on the scope of this ticket. The rationale laid out there applies to this budget requests endpoint as well.

Acceptance Criteria

• Update the existing community district filtering functionality on the findCommunityBoardBudgetRequests endpoint to use two separate query parameters: boroughId and communityDistrictId. communityDistrictId should only represent the Id of a CD.
• Add new boroughId query parameter to findCommunityBoardBudgetRequests endpoint OpenAPI documentation
• Update OpenAPI documentation for communityDistrictId to reflect changes
• When a valid boroughId is passed, but no communityDistrictId is passed, only projects that intersect with the given borough are returned.
• When a valid boroughId and communityDistrictId are passed, only projects that intersect with the given community district are returned
• When communityDistrictId is passed with no boroughId, throw an error and return a 400 Invalid client request error.

Dependent on completion of issues under ae-data-flow #117

[TangoYankee]

#549 (comment)